G SCHRADE Pullball Metal w/ Metal ball automatic knife early 1937 Patent

Vintage G SCHRADE Pullball Metal w/ Metal ball automatic knife early 1937 Patent. Measures 2 7/8" closed including the ball and 4 7/8" open. The clip blade is nearly full and shiny and is stamped G SCHRADE in an arch over PAT 11-9-37 which makes this an early knife made before 1944. Metal scales are silver in color with some light scratches and handling marks. Rare metal pull ball, normally plastic. The knife works well, stays closed and opens when ball is pulled. Doesn't always open 100%, but can push it into full open position easily. These are not designed to lock open. VG+ condition.