Actually Gibson confirms: 2005-2014: YDDDYRRR where Y is last digit of year, and fifth digit is same Y. So year is 197Y, 198Y, 199Y, 200Y.
Example: 82765501 Digit1=8, Digit5=5 — mismatch. So example wrong. So ignore bad example. gibson serial number
Example: 81234567 → first digit 8 = 2008? 1978? If fifth digit=1? fails. So invalid. Actually Gibson confirms: 2005-2014: YDDDYRRR where Y is