In 2005, Gibson added a sixth digit to account for increased production. The year is still determined by the 1st and 5th digits.
Elias pulled the reference book closer. "Verifying a Gibson isn't about checking one number. It's about cross-referencing the story the guitar tells." verify gibson serial number
Elias turned the guitar over and peered into the treble-side F-hole. This was the acoustic guitar equivalent of checking a suspect's alibi. Early solid-body Gibsons, especially high-end models, often had a Factory Order Number (FON) stamped inside. In 2005, Gibson added a sixth digit to