Whitman Expo
1861-S Paquet Double Eagle, rare 1930-S Indian Eagle and early U.S. gold also rank among July 16-18 event highlights.
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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
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Coin Value History
1851 G$50 Humbert, Target Rev, 887 THOUS, Reeded Edge, K-6 PR
Currency
Grade Range
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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
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Events
Midlands Coin Club Coin, Currency and Collectibles Show - SC
Location: Medallion Center
Friday, May 1, 2026
