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.
Forum Auctions Fine Books, Manuscripts and Works on Paper 26th March 2026
Forum, Mar. 26: Book of Hours.- Heures a lusaige de Romme, printed on vellum, with 14 full-page illuminated miniatures, Paris, N. Higman for J. de Brie, [c.1521]. £20,000-30,000
Forum, Mar. 26: France.- Book of Hours, perhaps Use of the Abbey of Saint-Gildas de Rhuys, with thirteen miniatures surviving from an original cycle of at least twenty, [c. 1430]. £15,000-20,000
Forum, Mar. 26: Milton (John). Paradise lost. A Poem in Ten Books, first edition, Pforzheimer's sixth state, S. Simmons, 1669. £8,000-12,000
Forum, Mar. 26: Blake (William). Illustrations of the Book of Job, one of 215 first issue "Proof" copies, this one of 65 copies on "French" paper, Published by the Author, March 8, 1825 [but March, 1826]. £15,000-20,000
Forum Auctions Fine Books, Manuscripts and Works on Paper 26th March 2026
Forum, Mar. 26: Christie (Agatha). The ABC Murders, first edition, The Crime Club, 1936. £15,000-20,000
Forum, Mar. 26: Halley (Edmund). Astronomiae Cometicae Synopsis, in Philosophical Transactions of the Royal Society, no. 297, pp.1882-99, March 1705. £10,000-15,000
Forum, Mar. 26: Haytham (Ibn al) [known as Alhazen]. Opticae Thesaurus...Item Vitellonis Thuringopoloni libri X..., first edition, Basel, August, 1572. £20,000-30,000
Forum, Mar. 26: Kepler (Johannes). Dioptrice seu demonstratio eorum quae visui & visibilibus propter conspicilla non ita pridem inventa accidunt, first edition, Augsburg, David Frank, 1611. £12,000-18,000
Books & Autographs Wednesday 25 March
Koller, Mar. 25: KAFKA, FRANZ, SCHRIFTSTELLER. Eigenh. Brief mit Unterschrift. Prag, 20. Oktober [19]15. CHF 30,000-40,000.
Koller, Mar. 25: EINSTEIN, ALBERT. Zwei eigenhändige Briefe an Ernst Gabor Straus, unterschrieben "A.E" bzw. "A. Einstein". [Princeton], [19]45. und [1950]. CHF 30,000-40,000.
Koller, Mar. 25: HORTENSE DE BEAUHARNAIS, MUTTER VON NAPOLEON III. Album aus ihrem Besitz mit 69 Aquarellen und Pinselzeichnungen in Sepia oder Grau… CHF 14,000-18,000.
Koller, Mar. 25: ZOOLOGIE - ORNITHOLOGIE - Seligmann, Johann Michael. Verzameling van uitlandsche en zeldzaame Vogelen. Teile 1-8 (von 9) in 2 Bänden. Mit 421 prächtig altkolorierten Kupfertafeln. CHF 14,000-20,000
Koller, Mar. 25: BOTANIK - Berlèse, Lorenzo und Johann Jakob Jung. Iconographie du genre camellia... 3 Bände. Mit 300 Farbstichtafeln "a la poupée.” Paris, [1839-]1841-1843. CHF 12,000-18,000.
