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The serial number I was given is 90143453. the -453 is a little interesting because doesn't that mean it is supposed to be a Kalamazoo guitar? From what I read I thought those were discontinued in the 80's? Am I incorrect about that?
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Gibson went to a serial format in the late 70's where the date was embedded in the number. The first and fifth numbers are the year. The 3 digits between those are the day of the year. The last 3 indicate the plant and production number. When Kalamazoo closed in the 80's, they shuffled the number system between Nashville and Bozeman so that can lead to confusion. Sometime in the early 2000's, they added an extra number in there, but the decoding is still the same.
I've been told that the Nashville plant uses the 300-900 range. In other words, the first guitar made on a particular day is "301", the next one is "302" and so on.
Using that logic, that serial number indicates January 14, 1993 and was the 153rd guitar made that day in Nashville.
Now, if you call Gibson and they say that the serial numbers on that day only go up to 427, then you may have a fake...or maybe the number is good and someone copied it.
Edit: I've got some photos of a fake headstock next to a real one if you want to see the differences. That is usually the quickest way to tell.