Most use an 8 or 9-digit format stamped on the back of the headstock.
In 1977, Gibson introduced the 8-digit numbering system that is still used today for most Gibson USA models. gibson serial number identification
This guide breaks down the methods of identifying Gibson serial numbers by era, from early factory order numbers (FON) to modern 8- and 9-digit codes, helping you unlock your guitar's history. Where to Find the Gibson Serial Number Most use an 8 or 9-digit format stamped
Factory ranking (001-499: Kalamazoo, 500-999: Nashville). 2005–Present (9-Digit System) Format: YDDDYBRRR 6th Digit: A batch number was added (0–9). 2014–Mid 2019 (Special System) Format: YYRRRRRRR Where to Find the Gibson Serial Number Factory
Look for a Factory Order Number (FON) stamped on the neck block inside the body, which may be separate from the serial number. Gibson Serial Number Identification by Era 1. The Pre-War & Early Era (1902–1947)
With the introduction of the Les Paul, Gibson couldn't use interior labels. They began ink-stamping numbers on the back of the headstock.