The real identification comes from :

He navigated to a vintage guitar database.

"Yeah," Elias said, standing up and cradling the guitar like a newborn. "I think I found something. How much for the red SG?"

Example: = 123rd day of 1976, 001st guitar. Beautiful. If only it lasted.

: On some semi-hollow "SG" variants or special editions, you may find an orange or white label visible through an F-hole. 2. Decoding by Era The format of the number immediately identifies the era. Modern Era (1977–Present) Most modern SGs use an 8 or 9-digit impressed number. Gibson Serial Number Lookup - True Vintage Guitar

Many SGs from 1970–1972 have no stamped serial at all, only a handwritten or stamped number in the pickup cavity. Others have a 6-digit number with a space that means nothing. Good luck.