Yes that's very true, but these are commemorative coins not released for circulation. I'm not sure why they didn't keep the purity higher. Then again it was the seventies and they were are war a lot...
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I am from a former communist country. Here, with a population of 15 million in the 1950s, a series of commemorative coins in the 500/1000 fineness range was minted. I do not know why. I guess quantity took precedence over quality.