No 630133 left in July 1931. No. 631039 left S&W in Oct. 1931. No. 631929 left in July 1931. S&W did not ship guns in serial number sequence, as the shipping vault operated on the "last in-first out" system. Your gun, No. 631042, could have left in 1931, as did the three cited, however only a factory historical letter will tell you the exact date. Ed.