Dating gibson guitars by serial number
(G = Gibson, K = Kalamazoo, W = Recording King (Montgomery Wards).
If follows there is a third letter E, it stands for Electric.
In a random sequence numbers were stamped on the back of the headstock. In 1970, the orange labels in the body of acoustic guitars were replaced by white with orange rectangular labels.
Where to find the serial number The serial number is stamped or punched on the back of the headstock.
Factory Order Numbers (FON) with a letter from 1935 to 1941.
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.