Whitman Expo
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Obverse Description
English text; Bank of England seal; Queen Elizabeth II; coronation crown; computer chip circuitry; Bank of England headquarters, London; coats of arms; Queen Elizabeth II
Reverse Description
English text; mathematical table and formulae from Turing’s seminal 1936 paper, “On Computable Numbers, with an application to the Entscheidungsproblem;” ticker tape depicting Alan Turing’s birth date (23 June 1912) in binary code; technical drawings for the British Bombe; Automatic Computing Engine (ACE) Pilot Machine; Alan Turing; sunflower head as red foil patch
Catalog Information
GSID:
143282
Variety:
2020 Sig 33: John Prefix AA Intro: Expected 23 06 2021
BNB #:
B206a
Pick #:
PNL
Send Catalog Feedback
To: editor@greysheet.com
Subject: I would like to contribute catalog info to CDN for 2020 Sig 33: John Prefix AA Intro: Expected 23 06 2021
Body: Referring page: http://beta.greysheet.com/prices/item/2020-sig-33-john-prefix-aa-intro-expected-23-06-2021/gsid/143282 GSID: 143282 Title: 2020 Sig 33: John Prefix AA Intro: Expected 23 06 2021
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Request Pricing Handwritten date (1725 - 1793) Handwritten sig
Handwritten date (1725 - 1793) Handwritten sig
Handwritten date (1725 - 1793) Handwritten sig
Handwritten date (1725 - 1793) Handwritten sig
Handwritten date (1725 - 1793) Handwritten sig
Handwritten date (1725 - 1793) Handwritten sig
No date; no sig ; no s/n
Handwritten date (1725 - 1793) Handwritten sig
Handwritten date (1725 - 1793) Handwritten sig
Handwritten date (1725 - 1793) Handwritten sig
Handwritten date (1725 - 1793) Handwritten sig
BANK to right of seated Britannia
Handwritten date (1725 - 1793) Handwritten sig
Handwritten date (1725 - 1793) Handwritten sig
Handwritten date (1725 - 1793) Handwritten sig
Greysheet News
The Business of Numismatics: August 2026 Greysheet Editor's Letter
8/7/2026
Stack's Bowers Galleries Presents the Extraordinary Mack C. Chase Collection of Walking Liberty Half Dollars in the 2026 Global Showcase Auction
"These coins have been off the market for at least 10-15 years, and many of them are in older generation grading holders as well, adding to the excitement," comments John M. Pack.
8/7/2026
Events
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Location: Heritage Auctions
Tuesday, June 2, 2026
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Tuesday, June 2, 2026
Heritage Auctions: US Coins Tuesday & Wednesday Select Auction
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Wednesday, June 3, 2026