Soviet Union, Unusual 1 Kopeck 1988, Help To Evaluate The Coin Please.

@gxseries - how is soberly presenting facts, with citation trolling?

Granted, fingerprints are an issue, which occur on modern mint products of many countries today - I never made the claim that Leningrad or Moscow were 100% perfect. You keep returning to minor varieties that again, all mints accidentally produce - the proportion of these to be found in Soviet coinage is relatively small, say in relation to say, that of the USA.

I don't see any cheap errors of any particular consequence (ie, more than a grazed rim clip, or some sort of PMD, which you inexplicably seem to believe are QC issues, or errors) from the period before the chaos of the meltdown of the Soviet Union having been sold recently on ebay, or any major auction house for that matter.

The issue of plastics is not a QC issue, but rather an oversight - and its exceedingly easy to find countries that struggled with similar issues, notoriously Spain and Belgium, whose PVC soft holders mean that today, virtually all sets suffer some issue or another. Generally, many mints didn't even think about the composition of their packaging, as the effects only became known years later.

As for the OP coin, I have explained, as per above, how certain components of the alloy can leach out and deposit themselves on the surface of the coin. I am not saying that I am necessarily correct, but this is a process that I have seen many times, and is so far the most plausible in this case. Weight variance here will be so minor as to likely not reveal much if anything.

Rather than name-calling and blustering, perhaps you can sit back and learn. Again, you started this by slandering me in another thread (something which I do not take at all lightly), and I still expect an apology.

@Ezhik_Lt - thank you for chiming in... Rylov outlines at lest 4 lines of QC at Leningrad, and although there likely was the occasional malpki and berlinki break, and the usual 'friday phenomenon,' those who study the coinage of the Soviet Union know that the mint generally operated to a good standard - gxseries owns many coins, but apparently doesn't know much about them... my take is that printed books are better than youtube videos, or random google searches in terms of the acquisition of knowledge.