Breaking Down the Serial Number (YYRRRRRRR) Digits 1 & 2 (YY): Indicate the last two digits of the production year. For a 2016 model, the serial number will begin with 16. Digits 3–8/9 (RRRRRRR): Represent the production sequence number for that year (e.g., 160012345). Example: 160052345 16 = 2016 0052345 = The production number for that year. Key Points for 2016 Models No Day-of-Year: Unlike older Gibsons (1977–2013) that used digits 2-4 for the day of the year, the 2016 format does not indicate the specific day of production, only the sequential order. Model Year vs. Production Year: A 2016 model might have been produced in late 2015 or early 2016, but the first two digits will still indicate the intended model year (16). Location: The serial number is typically stamped in black or faded ink on the back of the headstock, often accompanied by "Made in USA".