I inherited a Steinberger GM-1T, well, I think it is. I don't play and no little about guitars, less about this other than some research. Here is what Gibson said based on immages I sent:
This appears to be a GM-1T model. Unfortunately, this serial number is not listed in the Steinberger Ledger Archives. However, the serial numbers N10083 and N10085 were both shipped from the factory in January of 1990, so it is likely this went out around the same time. "
Gibson Customer Service
I have the guitar on ebay . I did get this message from someone who saw it on ebay:
A heads up, I believe this is a self build from parts. My judgement on this is based on the fact the body has a wood effect, which was never available from Steinberger. Your best way of checking to see if it was an original that was sanded down is to open up the cavities for the electronics and the pickup and see if there is a steinberger serial number on the body (if so take a photo). Without that this guitar is worth half the price, you may actually get more money by splitting it into parts. You'll get close to $1000 for the TT, 500-600 for the neck, and the rest you could possibly get about 300 for, so 2k total. (Worth noting I'm not interested in buying, just a steinberger fanatic giving some advice :P)
I don't want to mislead anyone...what do you all think?