Phil DB has an example with a mm ring, L/11.
I think I recall he was given it or something in the 1970's or 1980's, I don't remember exactly.
I also know of one that was on one of those so called dubious ''retailor boards'' which was marked with a ''3'' I think, I got the ring marked KVM but the West had long gone.
Too early in the morning for me to be thinking circumference, gauge and metal types of rings to this and that one etc etc
Good luck
I think I recall he was given it or something in the 1970's or 1980's, I don't remember exactly.
I also know of one that was on one of those so called dubious ''retailor boards'' which was marked with a ''3'' I think, I got the ring marked KVM but the West had long gone.
Too early in the morning for me to be thinking circumference, gauge and metal types of rings to this and that one etc etc
Good luck
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