Thanks for the link - which works ok.
I have tried to find other examples with a label but so far no luck. I did however find a similar label within a dealer site. That other label has straight sides, not "scalloped" [oor "perforated"] and the dealer states that the scalloped one is older (pre-1972 - I think) and the straight-sided one is still in current use (maybe).
Unfortunately I have misplaced my research result details so will have to look again.