Like American gold, - even common dates, - lots of European crown sized coins have been faked at some time or other, the best fakes are done in recycled coin silver.
So weight and XRF may not necessarily be conclusive tests.
Although I would have been happier to examine it in hand before buying, nevertheless from the pix presented, this coin looks to be OK.
An experienced vammer would have the skill for best judgement, but would need to do research first.
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