Thank you very much for the info.
The 1980 year line will be added, even twice since the 1980 issue exists with CHI mint mark (struck in Valcambi) and the White Tower mintmark (struck by the Royal Mint in London).
Here's a link to the complete series with the CHI mintmark: https://auctions.stacksbowers.com/lots/view/3-O5BK0/cayman-islands-gold-proof-set-10-pieces-1980-gem-proof and here the complete series with the White Tower mintmark: https://www.acsearch.info/search.html?id=9649599
Also Krause and Schön references will be added, as well as the Mints and the series name, and better cropped pictures.