Sample of penicillin mould, signed and inscribed by Fleming on the reverse "The mould that first made Penicillin/ Alexander Fleming", — FLEMING (ALEXANDER)

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Estimate: £4,000–£6,000 hammer ≈ $4,925–$7,387
Result
Performance
Sale: Bonhams — Fine Books and Manuscripts, London, Knightsbridge · 1 March 2017
Record ID: TB-2026-1441509
Record: first seen 23 Jul 2026 · updated 23 Jul 2026 · source ↗
Cite this record: TB-2026-1441509 — https://thebasis.art/cite/TB-2026-1441509

Fleming, Sample of penicillin mould, signed and inscribed by Fleming on the reverse "The mould that first made Penicillin/ Alexander Fleming",. Bonhams, 1 Mar 2017, lot 92. result recorded. TheBasis.Art, TB-2026-1441509.

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Fleming, Sample of penicillin mould, signed and inscribed by Fleming on the reverse "The mould that first made Penicillin/ Alexander Fleming",. Bonhams, 1 Mar 2017, lot 92. result recorded. TheBasis.Art, TB-2026-1441509.

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From the same sale Fine Books and Manuscripts · Mar 2017

Lot	Artist	Estimate
The Life of a Sportsman. By Nimrod, FIRST EDITION, FIRST ISSUE, Rudol…	Apperley	£700–£900
HERALDRY Illuminated genealogy collected by Peter Le Neve, Norroy Kin…	—	£2,000–£3,000
MILITARY - ROYAL ARTILLERY AND CHINA Fine album of approximately 130 …	—	£2,000–£4,000
Release from Robert Elston of Colsterworth, yeoman, and his wife to T…	Newton And Woolsthorpe Manor	£2,000–£3,000
New British Atlas, Containing a Complete set of County Maps, on which…	Teesdale	£800–£1,200
Die zwölf Monate des Jahres, in bildlichen Darstellungen für den Ansc…	Englert	£5,000–£7,000

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The closest sold results by price, artist, and medium — the appraiser's comp set, generated from the corpus. All figures converted to USD at current reference rates.