Whitman Expo
New coins from Australia and New Zealand.
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, its feathers resembling plates of armor. Above, the legend ESTADOS UNIDOS MEXICANOS.
Reverse Description
To right of center, a simplified rendering of the round ball-court marker from the ancient Mayan ritual ball game; $20 is superimposed on the left side of the marker. Above the peso symbol ($), CULTURA MAYA; below the symbol, the date. At the bottom, the mintmark M.
Catalog Information
GSID:
295315
Obverse Lettering:
ESTADOS UNIDOS MEXICANOS
Reverse Lettering:
CULTURA MAYA, $20, 1981, Mo
Weight (gr):
15.14 gr
Strike Type:
Proof
Diameter:
32
Coin Shape:
Round
Edge:
Lettered
Variety:
Type 1, Aztec Calendar, Copper-nickel
Variety 2:
KM-486
Coin Date:
1983-Mo
Denomination:
20P
Designation:
PR
Mint Location:
Mexico City
Mint Mark:
Mo
Mintage:
3Known
Coinage Type:
Coinage Reform of 1905
Coinage Years:
1980-1984
Composition:
0.75 copper, 0.25 nickel
PCGS #:
411401
Krause #:
KM-486
Send Catalog Feedback
To: editor@greysheet.com
Subject: I would like to contribute catalog info to CDN for 1983-Mo 20P Type 1, Aztec Calendar, Copper-nickel, KM-486 PR CAM (KM-486)
Body: Referring page: http://livetest.greysheet.com/prices/item/1983-20-pesos-mexico-world-coins/gsid/295315 GSID: 295315 Title: 1983-Mo 20P Type 1, Aztec Calendar, Copper-nickel, KM-486 PR CAM (KM-486)
Subscribe to View
Log In
View more data, info, and visualizations. Get access to retail and wholesale pricing as well as auction data.
Pricing Data Not Yet Available
We are constantly adding to our pricing database and prioritize user requests. Click below to request pricing for this item.
Request Pricing1917 20P Aztec Calendar, Gold, KM-478 MS
Worth: $2,156 – $2,686
1918 20P Aztec Calendar, Gold, KM-478 MS
Worth: $2,156 – $2,686
1919 20P Aztec Calendar, Gold, KM-478 MS
Worth: $2,156 – $2,486
1920 20P Aztec Calendar, Gold, KM-478 MS
Worth: $2,156 – $2,486
1920/10 20P Aztec Calendar, Gold, KM-478 MS
1921 20P Aztec Calendar, Gold, KM-478 MS
Worth: $2,156 – $2,486
1921/11 20P Aztec Calendar, Gold, KM-478 MS
1959 20P Aztec Calendar, Gold Restrike, KM-478 MS
Worth: $2,156 – $2,386
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
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: September 17, 2026
9/17/2026
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
