You should check the 3 big coin variety websites for a possible match. Then post a close-up photo
of the areas on your coin that you think might be a DDO. Link posted below to get you started.
https://doubleddie.com/1949204.html
of the areas on your coin that you think might be a DDO. Link posted below to get you started.
https://doubleddie.com/1949204.html