The differences between original and Mirco playfield is well documented, although mainly by playfield restoration companies with, in my humble opinion, a vested interest.
Here's my mint/new Mirco and my spare 21yr old original (the Mirco is under glass and different room lighting)
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Finding a truely mint original playfield after 21yrs is no mean feat! Probably much more expensive than a new Mirco too! My new playfield has a thin polycarbonate layer over the top to prevent balls ever touching it, which also ensures the surface is flat.
I think his auction is over priced for a Pin with minor insert wear, and essentially it was bought like that - no work done themselves to my knowledge.
Note the seller is on pinside and appears to keep his games in a conservatory, that won't help with fading!
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And one of mine again for luck:
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