Constellation cal.551 black dial (authenticity)

Unfortunately, the dial is obviously refinished but, I suppose that was declared in the sale? If not, you might be able to get some comeback.

The case is very polished as noted by @No Mercy although the fact that the movement looks tired would be less of a concern because you say it will be overhauled before you get it.

It's not a good buy for collectors but if you like it and it comes with a 2 year warranty and the price wasn't excessive (I suspect it was) then you should be able to enjoy it.

Best wishes, Chris

Black dialed Connies are really best avoided by new collectors, nearly all of them are either fake or redials, this one being the later. It’s an expert only type of game to hunt.