The one thing he never removed though was the original Maestro tremolo as he states "It's the look.
It's the kind" even though it ruins tuning stability. Here is a site furnished by Gibson that should be some help.
So if you can't figure out the date and all, maybe they can help out. RIALNUMBERS.pdf, it fits within the 1968 range, which would make this SG 41 years old. It also looks like this beauty is staying at home 98% of the time. So nice to see a bit of artistic history that is still there to please people If I'm not mistaken, 1968 is when Gibson re-started making the Les Paul.
Search/ Now if only I could find my Dad's old .22 cal rifle with the curly maple stock that I pawned one day... The guitar has it's good days and its bad days, its why I named her "Phoenix". The SG had taken it's place in the early '60's until there was a popular request to re-introduce the Les Paul.
It should also be noted that the Nashville plant has not reached the 900s since 1977, so these numbers have been reserved for prototypes.
Examples: 70108276 means the instrument was produced on Jan.10, 1978, in Kalamazoo and was the 276th instrument stamped that day. 3, 1985, in Nashville and was the 1st instrument stamped that day.
A few bolt on neck instruments had a date ink stamped on the heel area.
In 1977, Gibson first introduced the serialization method that is in practice today.
All numbers were impressed into the wood and a six digit number assigned, though no particular order was given and some instruments had a letter prefix. Year (s) Approximate Series Manufacture 1970, 1971, and 1972 100000s, 600000s, 700000s, 900000s 1973 000001s, 100000s, 200000s, 800000s and a few A 6 digit numbers 19 100000s, 200000s, 300000s, 400000s,500000s, 600000s, 800000s and a few A-B-C-D-E-F 6 digit numbers 1975-77 During the period from 1975-1977 Gibson used a transfer that had eight digit numbers, the first two indicate the year, 99=1975, and 06=1977, the following six digits are in the 100000 to 200000 range. In 1970, the words "MADE IN USA" was impressed into the back of instrument headstocks (though a few instruments from the 1950s also had MADE IN USA impressed into their headstocks as well).This updated system utilizes an impressed eight digit numbering scheme that covers both serializing and dating functions.The pattern is as follows: YDDDYPPP YY is the production year DDD is the day of the year PPP is the plant designation and/or instrument rank.