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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
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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://livetest.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
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Greysheet Podcast: RARE COIN MARKET EXPLODING! Ian Russell Reveals the Coins Collectors Are Buying NOW [Video]
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Events
Heritage Auctions: US Coins Tuesday & Wednesday Select Auction
Location: Heritage Auctions
Wednesday, July 1, 2026
Heritage Auctions: World & Ancient Coins Wednesday & Thursday Select Auction
Location: Heritage Auctions
Thursday, July 2, 2026
