Vintage Columbian HYDROSONIC 15" Brass Bronze Boat Propeller Prop LG 15 P14 L

D15=15" round P14 = 14" pitch. L = Left-Hand rotating M=?. Deep Stamp COLOMBIAN LG D15 P14 L O p (photos 17, 18, 19). 15 over 14 M stamp on one edge of bore (photo 6).

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