I've just found this little gem. It says there are perforations for these stamps using letters. I havent tried the search button yet but thought I'd put it up for all and sundry. I'm sure to come across some strange things (being me)
Thank you so much Partime, and yes my days of 'Eureka' are well behind me! But I could ask about good calipers. Il purchase some this week and put up some pics of measuring and then perhaps be advised on correcting technique thanks again
And it look like a Type 3 roulette to me also. Type 2 is a possibility, but they typically look blunter to me. They are definitely too long to be a Type 1 like this:
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