I should have said, 1985 — which is a yellow decal motif on purple enamel.

I'm grateful for the five replies so far ... and the answer seems conclusive enough. I hope that, as archived, the collective answer will serve future inquirers. Before this juncture, the subject of brakes and and their respective dimensions never crossed my mind. The brakes just came with the machine. A nude frame brings along a raft of new, vital considerations. Cheers — Lorne/Lenton58