Disclaimer: Gibson serial number research relies on historical records that have gaps and inconsistencies. This guide is intended for general identification purposes.
: Some early acoustics have a Factory Order Number (FON) ink-stamped directly onto the wooden neck block inside the guitar . How to Decode the Numbers
Gibson added the "MADE IN USA" stamp below the serial number, which helps distinguish these from 1960s models. Specialized Gibson Serial Searches Some specific lines use unique identifiers: Gibson App Gibson Serial Number Lookup