You'd be looking at H Lloyd decals for a proper period set. It's too old for the ones available on eBay, which only go back to early 70's. He'll sort you out with a period 531 main tubes decal too.
@ColnagoDaft started
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You'd be looking at H Lloyd decals for a proper period set. It's too old for the ones available on eBay, which only go back to early 70's. He'll sort you out with a period 531 main tubes decal too.