Dating gibson j 45 serial number
Exceptions: Some high-end models and lap steels from 1939-1940 have been added the letter A, to the prefixes D, E or F.
Factory Order numbers with a letter from 1952 to 1961.
(G = Gibson, K = Kalamazoo, W = Recording King (Montgomery Wards).
It was also from 1970 "MADE IN USA" stamped on the back of the headstock.
If your guitar has an eight-digit serial number stamped on it, it was made after Gibson changed its numbering system in 1975.
If there is no eight-digit serial number found, check the bottom of the guitar neck, which can be seen by looking inside of the guitar's sound hole.
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).
When a six-digit serial number is concerned, there is no space, because the highest number in four digits (9999) has been exceeded and so fills the space. In 1955, Gibson forgot to put back the serial number range to 0001. For this reason, the array of four-digit serial number was exceeded after 9999.
Another exception to the above rules is in the autumn from 1958, where a some Les Paul Juniors and Specials had a four-digit serial number. From 1970 to 1975, the 6-digit serial numbers randomly generated.