Once upon a time collectible paper auctions were unusual and well-spaced out. In the past, when there was a quiet month, auction houses took opportunities to have siestas. Anymore, quiet months are opportunities to sell material that need extra visibility. For that, August and January are perfect.
These days we regularly cover 250+ auctions a month. During this August however, we expect to cover a slim 140 sales that convert into 4.5 sales a day. For the rest of the year, the pace will pick up again.
While the auctions need to take some time off, the bidders will still be looking for opportunities. That translates into a higher percentage of lots sold when the sales offered are down. Net net, consignors may be sitting on the edge of their seat it usually works out well.
The prices drop a bit while the percentage of lots sold rise. Why? Because it’s August.
For the knowledgeable, this quiet period represents a chance to test their skills.
Here are the August numbers for the past 15 years:
Year
Total Lots
Lots Sold
% Lots Sold
Ave $ Value
Median Value
Total August Sales
2024
40195
34860
0.867
$1,213.00
$250.00
$42,285,180.00
2023
33377
28736
0.861
$1,784.00
$241.00
$51,265,024.00
2022
29170
25839
0.886
$2,067.00
$275.00
$53,409,213.00
2021
37459
33682
0.899
$1,552.00
$228.00
$52,274,464.00
2020
27823
24034
0.864
$955.00
$200.00
$22,952,470.00
2019
23792
20523
0.863
$1,009.00
$180.00
$20,707,707.00
2018
24489
20558
0.839
$1,370.00
$200.00
$28,164,460.00
2017
17676
14180
0.802
$879.00
$188.00
$12,464,220.00
2016
16641
14087
0.847
$877.00
$180.00
$12,354,299.00
2015
21679
15421
0.711
$790.00
$155.00
$12,182,590.00
2014
18576
15612
0.840
$742.00
$167.00
$11,584,104.00
2013
10996
8465
0.770
$1,336.00
$264.00
$11,309,240.00
2012
7273
5499
0.756
$516.00
$156.00
$2,837,484.00
2011
5213
3885
0.745
$538.00
$192.00
$2,090,130.00
2010
3824
2939
0.769
$559.00
$230.00
$1,642,901.00
Enjoy your vacation. And remember your cellphones can get into your RBH accounts while you’re on vacation.
Forum Auctions Natural History: The remaining stock of Antiquariaat Junk, 1899-2026 25 March 2026
Forum, Mar. 25: Botany.- Andrews (H.C.) Coloured Engravings of Heaths, 4 vol. in 2, first edition, [1710,--94]-1802-1809-[1830]. £10,000 - £15,000.
Forum, Mar. 25: Butterflies.- Cramer (Pierre) and Caspar Stoll. De Uitlandsche Kapellen voorkomende in de drie Waereld-Deelen…,, 5 vol., Amsterdam & Utrecht, 1779-91. £8,000 - £12,000.
Forum, Mar. 25: Voyages.- Darwin (Charles) and others. Narrative of the Surveying Voyages of His Majesty's Ships Adventure and Beagle, 3 vol. in 4, including Appendix to vol.2, first edition, 1839. £8,000 - £12,000.
Forum, Mar. 25: Butterflies.- de Graaf (Willem Diederik Vincent). [Inlandsche Kapellen in beeld], 170 fine original watercolours, [Enkhuizen], [1800-40]. £8,000 - £12,000.
Forum Auctions Natural History: The remaining stock of Antiquariaat Junk, 1899-2026 25 March 2026
Forum, Mar. 25: Birds.- Dresser (Henry Eeles). A History of the Birds of Europe, 9 vol., including supplement, first edition, by the author, 1871-96. £6,000 - £8,000.
Forum, Mar. 25: Zoology.- Felines.- Elliot (Daniel Giraud). A Monograph of the Felidæ or Family of the Cats, first edition, for the Subscribers, by the Author, [1878]-1883. £25,000 - £30,000.
Forum, Mar. 25: Birds.- Frisch (Johann Leonard). Vorstellung der Vögel Deutschlandes, 2 vol., first edition, Berlin, Friedr. Wilhelm Birnsteil, [1736]-1763. £40,000 - £60,000.
Forum, Mar. 25: Birds.- Gould (John). The Birds of Great Britain, 5 vol., first edition, by the author, 1862-1873. £30,000 - £40,000.
Forum Auctions Natural History: The remaining stock of Antiquariaat Junk, 1899-2026 25 March 2026
Forum, Mar. 25: Pomology.- France.- Poiteau (A.) Pomologie Française. Recueil des Plus Beaux Fruits cultivés en France, 4 vol., Paris, 1846. £30,000 - £40,000.
Forum, Mar. 25: Botany.- [Robin (Jean)]. Histoire des Plantes, nouvellement trouvées en l'Isle Virgine…,, 1620; with Geoffrey Linocier L'Histoire des plantes, second edition, 1619-20. £3,000 - £4,000.
Forum, Mar. 25: Asia.- Japan.- Siebold (P.F. von). Nippon. Archiv zur Beschreibung von Japan, 7 parts in 6 vol., first edition, Leyden, [1832]-1852. £35,000 - £45,000.
Forum, Mar. 25: Asia.- Valentijn (Francois). Oud en Nieuw Oost-Indiën..., 5 vol. in 8, first edition, Dordrecht [&] Amsterdam, 1724-26. £8,000 - £12,000.
Forum, Mar. 25: Botany.- Australia.- Redouté (P.J.).- Ventenat (Étienne Pierre). Jardin de la Malmaison, 2 vol.,, Paris, 1803-04[-05]. £30,000 - £40,000.
ALDE, Mar. 11: AUGUSTIN (Saint). De civitate Dei. Rome, Konrad Sweynheym et Arnold Pannartz, 1470. €20,000 - €30,000.
ALDE, Mar. 11: [REGNART (LE LIVRE DE)]. [Le] Docteur en malice, maistre Regnard, demonstrant les ruzes et cautelles qu'il use envers les personnes… Rouen, 1550. €20,000 - €30,000.
ALDE, Mar. 11: TRITHÈME (JEAN). Polygraphie et universelle escriture cabalistique. Paris, [Benoît Prévost pour] Jacques Kerver, 1561. €8,000 - €10,000.
ALDE, Mar. 11: CAUS (SALOMON DE). La Perspective, avec la raison des ombres et des miroirs. Londres, John Norton, 1612.
ALDE, Mar. 11: NICERON (JEAN-FRANÇOIS). La Perspective curieuse ou magie artificielle des effets merveilleux de l'optique. Paris, Pierre Billaine, 1638. €6,000 - €8,000.
ALDE, Mar. 11: VONTET (JACQUES). L’Art de trancher la viande et toute sorte de fruits… S.l.n.d. [probablement Lyon, vers 1647]. €20,000 - €30,000.
ALDE, Mar. 11: HUGO (VICTOR). [Paysage spectral avec une église], [vers 1837]. €20,000 - €30,000.
ALDE, Mar. 11: [HERVEY DE SAINT-DENYS (LÉON D')]. Les Rêves et les Moyens de les diriger. Observations pratiques. Paris, Amyot, 1867. €3,000 - €4,000.
ALDE, Mar. 11: GACHET (PAUL-FERDINAND). Les Chats de Gachet (Manuscrit). S.d. [avant mai 1873]. €6,000 - €8,000.
ALDE, Mar. 11: [REDON (ODILON)]. PICARD (EDMOND). Le Juré. Monodrame en cinq actes… Bruxelles, Mme veuve Monnom, 1887. €7,000 - €9,000.
ALDE, Mar. 11: [TOULOUSE-LAUTREC (HENRI DE) ET HENRI-GABRIEL IBELS]. MONTORGUEIL (GEORGES). Le Café-concert. Paris, [1893]. €4,000 - €5,000.
ALDE, Mar. 11: [TERRY (EMILIO)]. Projet de fontaine. Dessin original au stylo et à l'encre noire. 1938. €2,000 - €3,000.
![<b>Forum, Mar. 25:</b> Botany.- Andrews (H.C.) <i>Coloured Engravings of Heaths,</i> 4 vol. in 2, first edition, [1710,--94]-1802-1809-[1830]. £10,000 - £15,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/c8ea395f-160f-48d0-8c6f-eb14b9c7bdf5.jpg "<b>Forum, Mar. 25:</b> Botany.- Andrews (H.C.) <i>Coloured Engravings of Heaths,</i> 4 vol. in 2, first edition, [1710,--94]-1802-1809-[1830]. £10,000 - £15,000.")
![<b>Forum, Mar. 25:</b> Butterflies.- de Graaf (Willem Diederik Vincent). <i>[Inlandsche Kapellen in beeld],</i> 170 fine original watercolours, [Enkhuizen], [1800-40]. £8,000 - £12,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/28c2fdc6-b72e-497e-9838-b2418859500f.jpg "<b>Forum, Mar. 25:</b> Butterflies.- de Graaf (Willem Diederik Vincent). <i>[Inlandsche Kapellen in beeld],</i> 170 fine original watercolours, [Enkhuizen], [1800-40]. £8,000 - £12,000.")
![<b>Forum, Mar. 25:</b> Zoology.- Felines.- Elliot (Daniel Giraud). <i>A Monograph of the Felidæ or Family of the Cats,</i> first edition, for the Subscribers, by the Author, [1878]-1883. £25,000 - £30,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/74388261-9139-43c1-bb56-f1801a1d2175.jpg "<b>Forum, Mar. 25:</b> Zoology.- Felines.- Elliot (Daniel Giraud). <i>A Monograph of the Felidæ or Family of the Cats,</i> first edition, for the Subscribers, by the Author, [1878]-1883. £25,000 - £30,000.")
![<b>Forum, Mar. 25:</b> Birds.- Frisch (Johann Leonard). <i>Vorstellung der Vögel Deutschlandes,</i> 2 vol., first edition, Berlin, Friedr. Wilhelm Birnsteil, [1736]-1763. £40,000 - £60,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/7b144b2a-cde0-4b1f-be06-fa9568cf4aea.jpg "<b>Forum, Mar. 25:</b> Birds.- Frisch (Johann Leonard). <i>Vorstellung der Vögel Deutschlandes,</i> 2 vol., first edition, Berlin, Friedr. Wilhelm Birnsteil, [1736]-1763. £40,000 - £60,000.")
![<b>Forum, Mar. 25:</b> Botany.- [Robin (Jean)]. <i>Histoire des Plantes, nouvellement trouvées en l'Isle Virgine…,</i>, 1620; with Geoffrey Linocier <i>L'Histoire des plantes,</i> second edition, 1619-20. £3,000 - £4,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/9a2a2dbe-8edf-4091-9a08-800f7aba747e.jpg "<b>Forum, Mar. 25:</b> Botany.- [Robin (Jean)]. <i>Histoire des Plantes, nouvellement trouvées en l'Isle Virgine…,</i>, 1620; with Geoffrey Linocier <i>L'Histoire des plantes,</i> second edition, 1619-20. £3,000 - £4,000.")
![<b>Forum, Mar. 25:</b> Asia.- Japan.- Siebold (P.F. von). <i>Nippon. Archiv zur Beschreibung von Japan,</i> 7 parts in 6 vol., first edition, Leyden, [1832]-1852. £35,000 - £45,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/9b1bf9d0-4e40-41d0-9957-d89a37e1313c.jpg "<b>Forum, Mar. 25:</b> Asia.- Japan.- Siebold (P.F. von). <i>Nippon. Archiv zur Beschreibung von Japan,</i> 7 parts in 6 vol., first edition, Leyden, [1832]-1852. £35,000 - £45,000.")
![<b>Forum, Mar. 25:</b> Asia.- Valentijn (Francois). <i>Oud en Nieuw Oost-Indiën...,</i> 5 vol. in 8, first edition, Dordrecht [&] Amsterdam, 1724-26. £8,000 - £12,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/7ade0e81-f47b-45b3-bd2c-123a0469d82f.jpg "<b>Forum, Mar. 25:</b> Asia.- Valentijn (Francois). <i>Oud en Nieuw Oost-Indiën...,</i> 5 vol. in 8, first edition, Dordrecht [&] Amsterdam, 1724-26. £8,000 - £12,000.")
![<b>Forum, Mar. 25:</b> Botany.- Australia.- Redouté (P.J.).- Ventenat (Étienne Pierre). <i>Jardin de la Malmaison,</i> 2 vol.,, Paris, 1803-04[-05]. £30,000 - £40,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/0bc6575a-a6e5-44f6-8664-66fbad19c190.jpg "<b>Forum, Mar. 25:</b> Botany.- Australia.- Redouté (P.J.).- Ventenat (Étienne Pierre). <i>Jardin de la Malmaison,</i> 2 vol.,, Paris, 1803-04[-05]. £30,000 - £40,000.")
![<b>ALDE, Mar. 11:</b> [REGNART (LE LIVRE DE)]. <i>[Le] Docteur en malice, maistre Regnard, demonstrant les ruzes et cautelles qu'il use envers les personnes…</i> Rouen, 1550. €20,000 - €30,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/ddd3b34c-8abc-4eae-8474-6ea05406ccd0.jpg "<b>ALDE, Mar. 11:</b> [REGNART (LE LIVRE DE)]. <i>[Le] Docteur en malice, maistre Regnard, demonstrant les ruzes et cautelles qu'il use envers les personnes…</i> Rouen, 1550. €20,000 - €30,000.")
![<b>ALDE, Mar. 11:</b> TRITHÈME (JEAN). <i>Polygraphie et universelle escriture cabalistique.</i> Paris, [Benoît Prévost pour] Jacques Kerver, 1561. €8,000 - €10,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/cbc8d1a4-d991-48c7-b788-7554a6774b0e.jpg "<b>ALDE, Mar. 11:</b> TRITHÈME (JEAN). <i>Polygraphie et universelle escriture cabalistique.</i> Paris, [Benoît Prévost pour] Jacques Kerver, 1561. €8,000 - €10,000.")
![<b>ALDE, Mar. 11:</b> VONTET (JACQUES). <i>L’Art de trancher la viande et toute sorte de fruits…</i> S.l.n.d. [probablement Lyon, vers 1647]. €20,000 - €30,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/21ad2e05-5544-44aa-887d-76df423e17af.jpg "<b>ALDE, Mar. 11:</b> VONTET (JACQUES). <i>L’Art de trancher la viande et toute sorte de fruits…</i> S.l.n.d. [probablement Lyon, vers 1647]. €20,000 - €30,000.")
![<b>ALDE, Mar. 11:</b> HUGO (VICTOR). [Paysage spectral avec une église], [vers 1837]. €20,000 - €30,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/dc734df9-0811-477f-919a-2563b8452855.jpg "<b>ALDE, Mar. 11:</b> HUGO (VICTOR). [Paysage spectral avec une église], [vers 1837]. €20,000 - €30,000.")
![<b>ALDE, Mar. 11:</b> [HERVEY DE SAINT-DENYS (LÉON D')]. <i>Les Rêves et les Moyens de les diriger. Observations pratiques.</i> Paris, Amyot, 1867. €3,000 - €4,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/7e769889-43a5-495e-a931-c511da576c2b.jpg "<b>ALDE, Mar. 11:</b> [HERVEY DE SAINT-DENYS (LÉON D')]. <i>Les Rêves et les Moyens de les diriger. Observations pratiques.</i> Paris, Amyot, 1867. €3,000 - €4,000.")
![<b>ALDE, Mar. 11:</b> GACHET (PAUL-FERDINAND). <i>Les Chats de Gachet</i> (Manuscrit). S.d. [avant mai 1873]. €6,000 - €8,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/855dc2c0-17e3-4562-a1cc-2e7265c3769c.jpg "<b>ALDE, Mar. 11:</b> GACHET (PAUL-FERDINAND). <i>Les Chats de Gachet</i> (Manuscrit). S.d. [avant mai 1873]. €6,000 - €8,000.")
![<b>ALDE, Mar. 11:</b> [REDON (ODILON)]. PICARD (EDMOND). <i>Le Juré. Monodrame en cinq actes…</i> Bruxelles, Mme veuve Monnom, 1887. €7,000 - €9,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/b325eb41-450b-4bd6-851c-4125e04dfbe7.jpg "<b>ALDE, Mar. 11:</b> [REDON (ODILON)]. PICARD (EDMOND). <i>Le Juré. Monodrame en cinq actes…</i> Bruxelles, Mme veuve Monnom, 1887. €7,000 - €9,000.")
![<b>ALDE, Mar. 11:</b> [TOULOUSE-LAUTREC (HENRI DE) ET HENRI-GABRIEL IBELS]. MONTORGUEIL (GEORGES). <i>Le Café-concert.</i> Paris, [1893]. €4,000 - €5,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/6588f3a0-90f2-464c-8125-a76866eabe85.jpg "<b>ALDE, Mar. 11:</b> [TOULOUSE-LAUTREC (HENRI DE) ET HENRI-GABRIEL IBELS]. MONTORGUEIL (GEORGES). <i>Le Café-concert.</i> Paris, [1893]. €4,000 - €5,000.")
![<b>ALDE, Mar. 11:</b> [TERRY (EMILIO)]. <i>Projet de fontaine.</i> Dessin original au stylo et à l'encre noire. 1938. €2,000 - €3,000.](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/0840c8e4-4f35-4c95-b2d3-3d5addd6fd51.jpg "<b>ALDE, Mar. 11:</b> [TERRY (EMILIO)]. <i>Projet de fontaine.</i> Dessin original au stylo et à l'encre noire. 1938. €2,000 - €3,000.")