I think that your frame is 1988-89.....the first versions 85-87 had the seatpost bolt under the tube, not up....and you have two salded cable clamps under the bottom bracket box. my frame is like yours, but i have tha plastic cable clamp under the bottom bracket with a bolt :) so i think my frame is 90-91-92......and yours 88-89...
I think that your frame is 1988-89.....the first versions 85-87 had the seatpost bolt under the tube, not up....and you have two salded cable clamps under the bottom bracket box. my frame is like yours, but i have tha plastic cable clamp under the bottom bracket with a bolt :) so i think my frame is 90-91-92......and yours 88-89...