1301 Potrero Avenue, San Francisco. Bought by Crown Cork & Seal in 1931. Became Western Crown Cork and Seal Co. in 1942. Maker's marks: #1 used from about 1924-34, #2 used from about 1928-34, #3 used at 5:00 position from about 1931-34 (same sign in same position used on New Process crowns from 1920-1923; familiarity with years of design usage is necessary to distinguish them), #4 used from about 1934-38, and #5 used at 4:30 position from about 1938-42.