Hard to tell, but I wouldn't buy this in any case: "Crisp case with what I think is only one polish in its past...case sides are very straight and lugs are thick - whoever did the polish did a nice job on the bevels." Ah... no. If this is a gen Z serial with its original bracelet, the almost flush SEL fit suggests it has either been polished several times, or was ground down aggressively on that one polish. The bevels are way too much. They look like something off of a 1960s hand finished GMT, not a 2007 Sub. And the CGs are way too small.
Which brings me to my next point: lugs that are even and crisp but almost flush with SEL, and undersized CGs are all hallmarks of a JF V2 case. I'm not enough of an expert to say this is a franken, so take everything I say with a grain of salt. But I own a gen Z serial and a JF V2, and to me, this looks more like the JF case. The most suspicious thing is that there is no picture looking straight at the watch, with it squared up evenly to the camera. That's the easiest way to spot a JF. On a gen 5-digit watch (and most TC cases), when you look at the beveled edge of the crystal, you will see a little bit of white refracted up from each hour marker all the way around, which is the marker refracting up through the angled edge.
Here's a perfect example, and look at the beveled crystal edge in the straight on gen and JF shots
I included in this review. Because the JF rehaut is not quite gen-spec, you will not get the same effect. You'll only see the markers reflected up through the beveled edge of the crystal on one side, when you hold the watch on an angle--just like in the pic in this listing.