PRESTO Double #600 Smoke & Ice Celluloid vintage automatic knife

Vintage PRESTO double model 600 with Smoke & Ice celluloid scales (handles). The knife was made by the Geo Schrade Knife Co of Bridgeport, CT most likely between 1930 and 1940. It's the only size double made by the company and it measures 3 3/8" closed and 7 1/8 inches with both blades open and has brass liners and nickel silver buttons & safeties. Main blade is stamped PRESTO PAT PEND-G  and the small blade is stamped G SCHRADE in an arch over B'PORT CT. The blades are both 99% full or better with original finish with some spotting and light pitting. The Smoke & Ice celluloid scales are very attractive and in very nice condition. The knife works with both tips below the liners when closed, Good spring and both have excellent lockup open. Both safeties work. VG+ condition.