Hello and welcome to the forum.
Based on a quick glance over my lunch break this appears to be an early ‘occupation’ pistol dating from mid 1940, prior to the introduction alphanumeric serial numbering introduced by the Germans after the initial production run.
There’s no doubt that this pistol has been refinished and also resurfaced as some of the normally sharper finished edges appear rounded in the pictures. My bet is the slide markings have been ground off prior to re-bluing.
The serial numbers are not pre-war. The slide has had a second set of serial numbers added for some reason, possibly suggesting that the slide originated on another Vis -? The original slide serial number should be stamped onto the underside of the slide, and only visible when removed from the frame.
All in all a strange Vis. No surprise that it still operates well. These workhorses took a much worse abuse and still fired faithfully. I’ll look it over more closely when back home this evening.