Whitman Expo
On September 1, Stack's Bowers conducted a Rarities Night session in California as part of this firm's post-ANA World's Fair of Money® auction extravaganza.
Thank you to our sponsors!
Go check them out!
Approximately 75 K-6 slugs exist in private hands, around ten of which grade mint state. The K-6 obverse die is known to exhibit die rust in later states. The 887 Obverse die is paired with two reverse dies, and it is the reverse die that determines whether an 1851 Humbert 887-Thousandths $50 is a K-6 or K-7. The K-6 reverse die has a large “target” at its center and has outer engine turning that often extends beyond the edge of the coin. Two were found on the S.S. Central America. A pair of Kagin-6 slugs are known in proof format. The first of these was owned by Augustus Humbert. The second was sent to the U.S. Mint, and is now in the collection of the Smithsonian Institution.
Obverse Description
Eagle clutching shield and scroll AUGUSTUS HUMBERT UNITED STATES ASSAYER OF GOLD CALIFORNIA 1851 UNITED STATES OF AMERICA. FIFTY DOLLS. 887 THOUs.
Reverse Description
Engine turning
Catalog Information
GSID:
11789
Designer:
Augustus Humbert
Obverse Designer:
Augustus Humbert
Obverse Lettering:
AUGUSTUS HUMBERT UNITED STATES ASSAYER OF GOLD CALIFORNIA 1851 UNITED STATES OF AMERICA. FIFTY DOLLS. 887 THOUs.
Reverse Designer:
Augustus Humbert
Strike Type:
Proof
Coin Shape:
Octagonal
Edge:
Reeded
Variety:
Humbert
Variety 2:
Target Rev, 887 THOUS, Reeded Edge, K-6
Coin Date:
1851
Denomination:
G$50
Designation:
PR
Mint Location:
California
Mintage:
2 known
Coinage Type:
Private & Pioneer Gold
Coinage Years:
1851-1852
Composition:
Gold
Rarity:
8
PCGS #:
10215
Send Catalog Feedback
Subject: I would like to contribute catalog info to CDN for 1851 G$50 Humbert, Target Rev, 887 THOUS, Reeded Edge, K-6 PR
Body: Referring page: http://www.greysheet.com/prices/item/1851-humbert-fifty-dollar-reeded-edge-887-thous-kagin-6-territorial-gold-coinage-proof-strike/gsid/11789 GSID: 11789 Title: 1851 G$50 Humbert, Target Rev, 887 THOUS, Reeded Edge, K-6 PR
Subscribe to View
Log In
View more data, info, and visualizations. Get access to retail and wholesale pricing as well as auction data.
Coin Value History
1851 G$50 Humbert, Target Rev, 887 THOUS, Reeded Edge, K-6 PR
Currency
Grade Range
Sort by
Pricing
Values
Greysheet & CPG® Values
| Grade | CPG Value (Retail) | Greysheet Price (Wholesale) |
|---|---|---|
| PR65 | $6,000,000 | $1,234 |
1851 G$50 Humbert, 880 THOUS, 50 Rev, Lettered Edge, K-1 MS
Worth: $42,500 – $480,000
1851 G$50 Humbert, 880 THOUS, No 50, Lettered Edge, K-2 MS
Worth: $45,000 – $312,000
1851 G$50 Humbert, 887 THOUS, 50 Rev, Lettered Edge, K-4 MS
Worth: $50,000 – $624,000
1851 G$50 Humbert, Target Rev, 880 THOUS, Reeded Edge, K-5 MS
Worth: $25,000 – $200,000
1851 G$50 Humbert, Target Rev, 887 THOUS, Reeded Edge, K-6 MS
Worth: $19,000 – $430,000
1851 G$50 Humbert, Target Rev, 887 THOUS, No 50, Lettered Edge, K-7 MS
Worth: $42,000 – $108,000
1852 G$50 Humbert, Target Rev, 887 THOUS, Reeded Edge, K-11 MS
Worth: $22,000 – $264,000
Greysheet News
1796 Coin in Post-ANA Auction Rarities Session
11/9/2026
Review Held for Dollars, Comic Art Coins and Medals
Commissioners reviewed reverse designs for the four American Innovation dollars scheduled to be released in 2028 and obverse and reverse designs for the 2027 issues in the Comic Art Coin and Medal Program.
11/6/2026
The Business of Numismatics: November 2026 Greysheet Editor's Letter
The rare coin market so far in 2026 has been somewhat volatile, with greater price swings happening over a shorter period of time when compared to historical norms.
11/4/2026
Events
Heritage Auctions: US Currency Tuesday Select Auction
Location: Heritage Auctions
Tuesday, September 1, 2026
Heritage Auctions: World Paper Money Tuesday Select Auction
Location: Heritage Auctions
Tuesday, September 1, 2026
Heritage Auctions: World & Ancient Coins ANA Signature Auction & Platinum Session
Location: Heritage Auctions
Tuesday, September 1, 2026