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What mintmark / assayer would be indicated on an NGC slab insert?

Weird large 7 in the date as well. Thanks in advance.

This thread is particularly relevant to me, since I've recently pulled out a sizable number of world coins that I've purchased over the last ten years (really, more like "hoarded"). For some of the better pieces, I am astonished at how much they have increased in value based on auction records. I have a very few high-quality Chinese dollars and half-dollars that are up tenfold, and for that reason, they are going to NGC for certification. I also collect Mexican 8-reales and pesos, as well as 2-reales, and in my opinion, the NGC values are too low by maybe 50% for better circulated grade coins. On the other hand, where I see the biggest errors in being too high, are for mint state coins and more recent "modern" coins. I do believe NGC's price guide offers a tremendous resource if you look at it as "relative values", i.e. looking for big jumps between grades, or distinguishing common vs. key dates.

Old thread, but I recently looked at various HiBid auctions and was dismayed by the awful offerings I saw there.

That kind and amount of die polish is not at all distracting! I tend to really like the character that these add to the normal part of the minting process.

It looks like post mint damage, very possibly intentional, to me.

Neither the OP coin nor slab look legitimate to me.