Whitman Expo
New coins from Australia, Canada, and Spain.
Thank you to our sponsors!
Go check them out!
Obverse Description
Above a spray of oak and laurel, the national coat of arms with the eagle facing left; set at an angle below the wing, the date. Legend ESTADOS UNIDOS MEXICANOS.
Reverse Description
Above center, the Aztec Calendar Stone, with VEINTE PESOS around the lower edge. At the bottom, the gold weight: * 15 Gr. ORO PURO *.
Catalog Information
GSID:
295300
Obverse Designer:
Jorge Encisco
Obverse Lettering:
VEINTE PESOS, * 15 Gr. ORO PURO *
Reverse Designer:
Jorge Encisco
Reverse Lettering:
ESTADOS UNIDOS MEXICANOS, 1920
Fineness:
0.9
Weight (gr):
16.666 gr
Strike Type:
Business
Diameter:
27.5
Coin Shape:
Round
Edge:
Lettered
Variety:
Aztec Calendar, Gold
Variety 2:
KM-478
Coin Date:
1920
Denomination:
20P
Designation:
MS
Mint Location:
Mexico City
Mintage:
462,198
Coinage Type:
Coinage Reform of 1905
Coinage Years:
1917-1959
Composition:
Gold
PCGS #:
526170
Krause #:
KM-478
Send Catalog Feedback
To: editor@greysheet.com
Subject: I would like to contribute catalog info to CDN for 1920 20P Aztec Calendar, Gold, KM-478 MS (KM-478)
Body: Referring page: https://www2.greysheet.com/prices/item/mexico-1920-20-pesos-gold-coin/gsid/295300 GSID: 295300 Title: 1920 20P Aztec Calendar, Gold, KM-478 MS (KM-478)
Subscribe to View
View more data, info, and visualizations. Get access to retail and wholesale pricing as well as auction data.
Coin Value History
1920 20P Aztec Calendar, Gold, KM-478 MS (KM-478)
Value By Grade
1920 20P Aztec Calendar, Gold, KM-478 MS (KM-478)
CPG (retail) values
Currency
Grade Range
Sort by
Pricing
Values
Greysheet & CPG® Values
1917 20P Aztec Calendar, Gold, KM-478 MS
Worth: $2,178 – $2,708
1918 20P Aztec Calendar, Gold, KM-478 MS
Worth: $2,178 – $2,708
1919 20P Aztec Calendar, Gold, KM-478 MS
Worth: $2,178 – $2,508
1920/10 20P Aztec Calendar, Gold, KM-478 MS
1921 20P Aztec Calendar, Gold, KM-478 MS
Worth: $2,178 – $2,508
1921/11 20P Aztec Calendar, Gold, KM-478 MS
1959 20P Aztec Calendar, Gold Restrike, KM-478 MS
Worth: $2,178 – $2,408
1959 20P Aztec Calendar, Gold Restrike, KM-478 PR DCAM
1980-Mo 20P Type 1, Aztec Calendar, Copper-nickel, KM-486 MS
1981-Mo 20P Type 1, Aztec Calendar, Copper-nickel, KM-486 MS
1982-Mo 20P Type 1, Aztec Calendar, Copper-nickel, KM-486 MS
1982-Mo 20P Type 1, Aztec Calendar, Copper-nickel, KM-486 PR DCAM
1983-Mo 20P Type 1, Aztec Calendar, Copper-nickel, KM-486 PR CAM
1984-Mo 20P Type 1, Aztec Calendar, Copper-nickel, KM-486 MS
1985-Mo 20P Type 2, Victoria, Wide Date, Open 5, Alloy, KM-508 MS
Greysheet News
Weekly World Mint Coinage: August 13, 2026
8/13/2026
Atocha Silver Ingot Leads Heritage's Shipwreck & Treasures World Coins Auction to $459,498
Atocha, 1715 Fleet and Whydah treasures among top highlights in Aug. 9 event.
8/12/2026
Events
Heritage Auctions: US Currency Tuesday Select Auction
Location: Heritage Auctions
Tuesday, June 2, 2026
Heritage Auctions: World Paper Money Tuesday Select Auction
Location: Heritage Auctions
Tuesday, June 2, 2026
Heritage Auctions: US Coins Tuesday & Wednesday Select Auction
Location: Heritage Auctions
Wednesday, June 3, 2026