I would guess that '44 PPK is probably not proofed because the Nazis were in a hurry in 1944, just guessing. That gun might have some historical significance to it. Is it .32 or .380?
Slight thread jack, but that's interesting.
There's a couple of ideas from folks who know more than I do about this piece (thanks to some time spent in the various walther forum corners of the internet). One is that it is a "cigarette gun" one from the factory put together out of parts from the captured Walther factory by workers bribed/coerced to do the work with cigarettes while things wound down.
The overall look of the gun seems to confirm this idea. Interesting read on the capture of the factory:
http://forums.p38forum.com/forums/viewtopic.php?t=12611
Another interesting idea is that it is a hand-made forgery from pakistan. As in, entirely hand made. There is an old American Rifleman article that documents the pakistani repros; evidently they made all sorts of stuff, and it all was forged so well that the parts interchange with the original weapons (or so I have been told).
It may also be one that was re-worked and is none of the above. The serials are period to the shape of the slide, but may have been put back on during a reworking, as they don't look like factory serials.
It has spent some duty time in one of the flap holsters; the wear around the muzzle at the end of the slide is consistant with the type of pitting and corosion that PPKs got from heavy carry outdoors in the closed-bottom issue holsters that collected all sorts of crud and moisture in their bottoms.
Bottom line, though, nobody seems to know for sure, except that it's an older .32. Thanks for asking, MCgunner. Apologies to others for letting an auto into the wheelie forum...