Although it appears to be in good condition, it's no where near NOS. Look at the dirt around the pushers, crown and case back notches, along with wear on the underside of the lugs where the end links have worn. This is a nice looking watch but it's been worn significantly.
Regarding the black, I would guess that someone's used a black polish/paint to cover the case back to refill the writing and ended up getting it I the recesses of the hippocampus, which they then couldn't easily remove, so left it there.
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