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@Skülly
Decals definitley look like they were applied by a monkey.
Doesn't mean that they weren't applied to a respray of a Geoffrey Butler.
Unfortunately Geoffrey Butler themselves don't seem interested in helping one ascertain what age / genuine or not from frame numbers, they long since stopped building frames. I imagine they didn't keep the records, or at least when I spoke to someone at the shop a while back they were pretty unwilling to help.
If you like you can compare frame numbers with mine. However, my decals were applied after laquer, though they're transfers not vinyls, so I guess you could question whether mine is a GB as well. Chances are that they would have stuck to a certain number of digits and/or letters. I don't know it off hand but I'll have a look tonight. Mine is most probably early 70s though so details of frame building may not be worth comparing. It's possible that they comissioned other builders to make frames for them - I've never really found out much about them.
You would find frame identity numbers under the BB shell and stamped onto the fork steerer. Obviously you'd have to take the fork out to have a look.
If you want to re-apply decals the Geoffrey Butler shop have a box of the ones on your frame, maybe just get a new set ... and apply them a little more carefully.