I've got the same question for my old girl. Early 80s vintage, Celeste (of course).

Serial number, from each side of the top of the seat tube, is 2M on one side and 138E (I think it's an E) on the other. Made In Italy decal on seat tube down by the BB and "Nuevo Racing 12 Vel" sticker (partially readable) on the cross tube.

POS brakes (not original), wheels are the same, Campy front and rear derailleurs, Bianchi cranks, OFMEGA head set, TTT bars.

Any ideas? I doubt she's worth anything, but I'd like to know before I donate her. I've had her for 30 years...

Thanks all!