i'm not that knowledgeable about bikes but this particular one strikes me as rather a mystery, on one hand the tall bars and tail bar make it look like a chopper but then if you imagine it without those and a minimal seat then it has the look of a scrambler, especially if it had a scrambler exhaust high up to the side. What would it have looked like originally I cannot help but wonder, are those handle bars original please?

This is what it would have looked like originaly.

So the seat,sissy bar, front mudguard and exhausts have been changed.

thanks amb, i see it is annotated 'custom' meaning americanised i think. i prefer the wire wheels that you have now.