Dating gibson bass
Factory Order Numbers (FON) with a letter from 1935 to 1941.FON consists a batch number of usually four digits, followed by a one letter (sometimes prefixed by a space) followed by one or two digits (ranking).
(G = Gibson, K = Kalamazoo, W = Recording King (Montgomery Wards).The batch number, the first four digits of the FON, followed by a one or two-digit number. The first digit of the serial number is the last digit of the year.If the stamped number consists 5 digits, there is a space between the first and second digit (a separation between the last digit of the year and the actual serial number).Factory Order numbers with a letter from 1952 to 1961.The letter preceding the batch number in the FON, and indicates the year of production. Y1234 23 This were used from 1952 to 1961 on archtop models and stamped on the inside of the F-hole. An ink-stamped number from the back of the headstock. No serial numbers were used, Gibson just started therewith in 1953.