Hi, l'm looking for some expert advice!
I don't know much about this frame as all the stickers have been removed, but they have left a shadow of AMP on the seat post.
There is a stamp on the bottom of the shell case which say 'C75'?
There is a bracket brace on the back also has AMP on it.
I guess the question is, without these clues what would identify this frame as being from AMP?....and which model is it?

I don't know much about this frame as all the stickers have been removed, but they have left a shadow of AMP on the seat post.
There is a stamp on the bottom of the shell case which say 'C75'?
There is a bracket brace on the back also has AMP on it.
I guess the question is, without these clues what would identify this frame as being from AMP?....and which model is it?