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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
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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://beta.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
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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
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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
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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
