Whitman Expo
His free weekly newsletter offers insights on the coin and metals markets, and consumer education.
Thank you to our sponsors!
Go check them out!
Undated $20. Experimental piece. The regular reverse, uniface, was made very concave by passing it through the upsetting machine before and after striking.
Obverse Description
Blank.
Reverse Description
From the regular die of the period.
Catalog Information
GSID:
12271
Strike Type:
Proof
Coin Shape:
Round
Edge:
Plain
Variety:
Copper, Uniface Die Trial
Variety 2:
J-190
Coin Date:
(1857)
Denomination:
P$20
Designation:
PR
Mint Location:
Philadelphia
Mintage:
Unique
Coinage Type:
Pattern
Coinage Years:
1857
Composition:
Copper
Rarity:
unique
PCGS #:
11835
Send Catalog Feedback
To: editor@greysheet.com
Subject: I would like to contribute catalog info to CDN for (1857) P$20 Copper, Uniface Die Trial, J-190 PR BN
Body: Referring page: http://livetest.greysheet.com/prices/item/1857-pattern-die-trial-20-brown-judd-190/gsid/12271 GSID: 12271 Title: (1857) P$20 Copper, Uniface Die Trial, J-190 PR BN
Subscribe to View
View more data, info, and visualizations. Get access to retail and wholesale pricing as well as auction data.
Coin Value History
(1857) P$20 Copper, Uniface Die Trial, J-190 PR BN
Value By Grade
(1857) P$20 Copper, Uniface Die Trial, J-190 PR BN
CPG (retail) values
Currency
Grade Range
Grading Authority
Sort by
Pricing
1857 P1c Copper-Nickel, J-186 PR
Worth: $6,750 – $21,600
1857 P1c Copper, J-187 PR BN
Worth: $22,000 – $26,400
1857 P1c Nickel or German silver, J-187a PR
Worth: $50,000 – $60,000
1857 P25c Copper, J-188 PR BN
Worth: $4,200 – $8,400
1857 P$2 1/2 Copper, J-189 PR BN
Worth: $5,250 – $13,200
1857 P$2 1/2 Gilt Copper, J-189 PR
Worth: $7,800 – $9,360
Greysheet News
Consumer Advocate Mike Fuljenz Wins NLG's Newsletter Award
9/15/2026
Incredible Rarities Shatter Records Amid Furious Bidding at Stack's Bowers Galleries' Summer 2026 Global Showcase Rarities Night Session
Stack's Bowers Galleries, one of the world's largest and most prestigious rare coin auction houses, is proud to announce record breaking results from the Rarities Night session of its annual Summer Global Showcase Auction.
9/15/2026
Five U.S. Coins Bring 7 Figures in $67 Million+ Heritage ANA Auctions
Scandinavian gold rarities also command exceptional results.
9/11/2026
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
