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Its hard to say with certainty based on the photos, but I think it looks too opaque to be original. You should be able to see the grain through the finish. Here's a '56 TV that I no longer own for reference:
The wear on the back appears to have been done with sandpaper. Other non-original parts I see are the frets, tailpiece, studs, and pickguard.
I agree with guitplayer that it's probably a refinish. The shot of the back with the wear would suggest a refinish - it looks like the guitar was pore filled before the white coat which isn't correct. It should be misted in white first, then pore filled. I reckon that's why it looks more opaque than it should.
EDIT: This is the neck of my '56. You can see how the pore filler sits above the white layer and how there's white in the exposed pores, whereas on the guitar in question there's dark filler in the pores and the white is sat on top.
I would think it is a 54-56 based on the bridge locations too. Not sure if all single cuts had that small wire hole from the jack, but in 1958 the double cuts got a larger 1" hole from the jack to the cavity. Not sure if that was on Double Cuts only, or the last of the single cuts too.
I dunno. The serial number looks right for a '58, but the pickup position indicates 1954-1956. The photos all look like they were taken in a fog. Better pics would help.