Description Ruger Pre-Warning 3 Screw Old Model Blackhawk Convertible chambered in .45 with two six-shot cylinder for .45 Colt and .45 ACP, and with a 7.5" barrel. Manufactured in only two years between 1971 and 1972 with serial number 45-02446. Blued barrel, three screw frame, fluted cylinders, single action trigger, and hammer. Smooth wood grips with Ruger medallions. Adjustable rear U-notch and fixed front blade iron sights. Comes in its factory box with manual. Must ship to a FFL or C&R holder. Condition: Excellent with light handling and operational wear. Faint cylinder turn line. Bright and clean bore with strong rifling. Barrel Length: 7.5" Serial: 45-02446 Manufacturer: RUGER Caliber: .45 Colt/ACP Model: Old Model Blackhawk Year-Range 1971-1972 Book# 03426