Only about 500 Colt Shooting Master revolvers were manufactured in .357 magnum caliber. The included factory letter confirms the serial number, caliber, barrel length, finish, and June 27, 1939, date of shipment to Hibbard, Spencer, Bartlett & Company of Chicago, Illinois, as a single gun shipment. Elevation adjustable Patridge blade front and windage adjustable rear notch sights, standard markings, checkered hammer, trigger, and grip straps, and checkered medallion grips.