For a time during the Great Depression, clamshells were golden in Pismo Beach, California.
Los Angeles Olympics 1984 USA Complete Coin Set Sealed in Hard Clamshell Case
BankSupplies Clamshell Coin Holder Storage Box, Coin Sorter
Bear Paw Clam Shells for Burning Sage for Sale
1971 Canada British Columbia Silver Dollar Coin original clamshell case
Pluralistic: 10 Jul 2020 – Pluralistic: Daily links from Cory Doctorow
Single Yua Wenga Clamshell Currency from Papua New Guinea on Custom Black Stand For Sale at 1stDibs
Clamshell Currency - TV Tropes
Dog teeth - Unimerce Marketplace Collection
medtronic – Pluralistic: Daily links from Cory Doctorow