Luger?? yes I'm a newbie! What is this!

[Niblet]

Hi fellas,,Im an avid WWII German collector for several years now
but have never gotten into lugers much so pls excuse my ignorance,,A guy brought this into work to let me look at,,and I'm afraid i dont know exactly what it is,,,it doesnt have your typical wartime luger markings,, it is etched 722 in places,,others are stamped 722 and 22,,,all the #'s seem to match...but what are those wierd proof marks??? it has bakelite grips,,,and an etching inside the grip i can see with a flaslight,,,bore is very clean,,pistol is in very nice shape,,Thanks in advance,,,
oh yeah what is a typical ballpark value on this???
Tim