does anyone know what year & model this 175 in the attachment is ?

This is my TY175 and it was registered in Nov 1981.

That colour scheme ran from late 1980 to about 83/84 I think.............but basically all the bikes from 1975 - 83/84 were the same spec.

The only major change (apart from colour schemes) from the early ones to the one in your pic.........was that the earlier bikes had DID silver anodised rims (better) and the later ones had bare polished alloy Tagasaki rims.

Hope this helps.

JB