I don't think it's been covered by black sharpie. Looks more like the black sharpie used to write the serial has spilled all over. So I'd be worried to try to remove it.
Its weird though because if you look hard enough you can still read the numbers underneath the black smear and they do infact match the numbers that were written in the owners manual it came with
Let this be a lesson to stop buying mics from undeniable sources on the bay. If I had a dollar for every guy who bought a fake 57 off the net to save 20 bucks from buying one in a store...
I completely agree bro, I definitely learned my lesson honestly fuck ebay. Unless its absolutely unfathomably more expensive to buy it new. Thats what I'm doing from now on.
I have a Rode NTK and the serial number gets more and more blurry over the years. Can hardly read it by now.
I think the same happens with your mic. So no fake mic necessarily
So yours looks similar to mine and it just happend out of old age?