The ink stamped number consists of 5 digits, where there is a space between the first digit (representing the last digit of the year) and the following 4 (chronologic serial number).
If there is a 6 digit ink stamped number, there is no embedded space as the serial number has exceeded 9999 and now occupies the place where the space existed in numbers 9999 and lower.
The sixth number is now a batch number- batch 0 starts at the beginning of the day, and once we stamp 699, the batch number will change to 1.
Exceptions: Some high-end models and lap steels from 1939-1940 have been added the letter A, to the prefixes D, E or F.
This Article is designed to assist in dating and/or identifying instruments manufactured or distributed by Gibson Guitar Corp.
(G = Gibson, K = Kalamazoo, W = Recording King (Montgomery Wards).
If follows there is a third letter E, it stands for Electric.