Description
Chouinard Alcoa aluminum carabiner. Maker's mark 'Chouinard' stamped on one side, '820 ALCOA 7075' stamped on reverse. Exact date unknown but likely produced between 1958-1968. ALCOA stands for Aluminum Company of America. 820 is thought to be a design designation or a batch number. 7075 is the alloy type.