Treat the serial number like a driver’s license. It tells you who the guitar claims to be, but you still need to match the face (the guitar’s physical features) and run a background check (electronics, hardware). When in doubt, pay for a professional authentication (e.g., Gruhn Guitars, Carter Vintage, or Trogly’s Guitar Show authentication service).
This is the easiest system to read. Since 1977, Gibson has used an eight-digit system that tells you the exact day the guitar was made. check serial number gibson
On vintage instruments (1930s–1950s), you may find a separate FON stamped inside the body or on the neck block. Decoding Gibson Serial Numbers by Era Modern Era (1977–Present) Treat the serial number like a driver’s license