Agree with lukusw's observations. Some caveats though:
- breaking up a dry brittle (old) coil pair or strip can give very clean perf tips
- the pins cutting real perfs can leave a very clean inside perf on one side of the column of holes and a rougher side opposite often with minute paper pulls; so this stamp's left side could possibly be the cleancut side. However, the right side is very clean as well, not a good sign. That the perfs wander so much is bad, as lukusw notes.
Now, taking a cheap used 2c stamp from an old accumulation and matching the design size carefully gives:

So, I think the perforation matchup at the left is really good. Genuine perfs, I would say, though the 4c could still have been made from a straight edge stamp.
The right side uses the same 2c turned upside down. It's not a match. It's been reperfed in a slightly different gauge, as typical.
EDIT: Seller has a lot of [your word here] to link to his own "how to detect reperfed and regummed stamps". We'd want a look at the gum side, too.