Help please - Steel GT serial numbers

Good day eveyone,

I would like some help identifiying this GT frame I just bought. The groupset seems to be Shimano Exage 300LX, U Brake in the back, canti lever in the front and Kalin seat post which I am not sure is original or not. From what I can make of it, the serial number on the bottom bracket shell reads TM 8904 8906 but I am not sure, you can look for youself on the pictures. It was respayed by a previous owner thus me not knowing what it is. The paint has chipped and you can see a white/cream color underneath. I believe this frame to be a 1989-1990 GT Timberline but your opinion would be greatly appreciated

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Good day eveyone,

I would like some help identifiying this GT frame I just bought. The groupset seems to be Shimano Exage 300LX, U Brake in the back, canti lever in the front and Kalin seat post which I am not sure is original or not. From what I can make of it, the serial number on the bottom bracket shell reads TM 8904 8906 but I am not sure, you can look for youself on the pictures. It was respayed by a previous owner thus me not knowing what it is. The paint has chipped and you can see a white/cream color underneath. I believe this frame to be a 1989-1990 GT Timberline but your opinion would be greatly appreciated
I think the 89 timberline has the rear brake by the bottom bracket and the 90 has it internally routed? 300LX makes me think 1991 Talera
 
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