Coin Varity identification Polish 1971-MW 10Zt

cplradar · Oct 2, 2021

norantyki said: ↑

Ok, a little late to this party, but I do have a few things to add.

1. The only way (other than an XRF, which has been pointed out, needs to be in direct, or virtually direct contact with the surface of the coin) to distinguish the two is by weight.

2. The grading companies are terrible with the Polish Proba issues, and I have seen many mis-attributed or under-attributed on labels, across all 3 major TPGs.

3. The mintages in Krause are actually really poorly mis-transcribed from Kurpiewski's guide, which is itself not always 100% clear or correct. With the Probas, a very small number were struck in one metal (in this case pure nickel, and yes, it will be quite pure) for distribution to VIPs, senior mint employees / govt officials. A much larger number were then struck for sale to members of a subscription scheme that the mint ran for many years / for sale to members of the Polish Numismatic Society.

4. The precise mintage figures for this type are 51 200 (Cu-Ni), and 500 (Ni). In my experience, the 'limited' Proby generally come up in estate collections of the people who were presented them at the time / their immediate heirs, and generally in quantity. They are generally well-recorded as being from the limited strike, as these were produced specifically to be something special.

5. The likelihood of this being the Ni Proba is, in my opinion, very low, particularly if it was not specifically sold as such with some supporting documentation / an XRF report or weight.

Hope this adds some context to the discussion.
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Thank you! 200mg is not much of a weight difference, even if the coin was cracked out. I suppose he magnetic test would not work? I thank you for the background data!

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TheGame · Oct 2, 2021

I don't see why a strong enough magnet wouldn't work through the slab.

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Coin Varity identification Polish 1971-MW 10Zt

cplradar Talmud Chuchum

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Coin Varity identification Polish 1971-MW 10Zt

cplradar Talmud Chuchum

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