Here is a comprehensive guide (your "good paper") on decoding Gibson 6-digit serial numbers.
Typically NO "MADE IN USA" stamp. Serial numbers were impressed into the wood. gibson serial numbers 6 digit
In 1973 and later, they often switched to Y + DDDDD . Here is a comprehensive guide (your "good paper")
This is the most desirable era for collectors. In 1947, Gibson hit serial number 100,000 and continued sequentially. Gibson hit serial number 100