T-Mar.
The 91/92 Fuji Discoverer has a serial number if F1?80877. I am going to have to file the BB shell to figure out if the 2nd/3rd number combination is 1-something, or L-something. The 3rd digit may be a 6 but I do not know if the above is enough for you to go on. I have tried the soap thing and this is the best I can get with that. Next step-sand paper, but I would rather not go there.