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I can feel a new website coming on - maybe next winter.

the moon today:

I don't know this Numista rarity index at all, but from what I can see it appears that the higher the number, the rarer the item. I was initially thrown by the R7, because the grading scale used by ESC (for example) only goes up to 7 which means extremely rare. Freeman goes up to 20 which is ‘possibly unique’. With your (fairly standard) Charles II 4d rated R40, I deduce that index may go up to 100? ETA: just Googled, and indeed it goes up to 100, but they say it’s based on how many Numista members have the item and how often it is up for ‘swap’, so fairly esoteric, I'd say!

Ahh thanks for that it explains why its only slightly smaller than the halfgroat I bought the weight would have been another big giveaway. Overall very pleased with it though , thanks for the id info very useful.

will put pic on very soon

Big piece of British bronze from the Birmingham Workhouse - quite possibly the largest numismatic object struck for actual circulation by Matthew Boulton's steam powered machinery - this weighs almost 2.5 ounces.