Serial numbers show approximate date of manufacture.For all dates, you will need to look at the construction technique and components used to get a more precise date of manufacture.Ranking numbers for Bozeman start each day at 001 and the electrics may start as low as the 300s.
Many players don't, and sometimes (unless you bought it from new) it can be hard to tell.
Also, Gibson, as we all know, is one of the greatest manufactors of guitars, and having the status of one of the most desirable guitar brands ever has some disavantages, too: conterfeit Gibsons have been sold for many decades now, and many players sometimes don't even realise they've been fooled. This Article is designed to assist in dating and/or identifying instruments manufactured or distributed by Gibson Guitar Corp.
The Guitar Dater Project - Gibson Serial Number Decoder Anecdotally, it shows the correct year and factory for my gibsons.
Those directories are good for most Gibsons, but Gibson themselves have been pretty spotty.
I get several questions about Gibson serial numbers every day, and my initial answer is always to not expect or rely on the serial number alone to determine the year of manufacture.