Semi related, in Pismo Beach (California), shop owners used clamshells as proof-of-purchase / an alternative currency during the Great Depression https://www.s

Semi related, in Pismo Beach (California), shop owners used clamshells as proof-of-purchase / an alternative currency during the Great Depression https://www.si.edu/object/nmah_1066284 https://www.si.edu/object/nmah_1066284