I normally collect WWI era 7.65's and know diddly about WWII collectible pistols. A gunsmith friend of mine handed me this Radom Vis and asked if I could do a bit of research on it. I believe it is a Grade II sub.var.2 ? I understand it is hard to date Radoms but I am guessing it was manufactured around 1941? I have seen several letter prefixes in photos and posts but the U prefix on this pistol is the only one I have seen. Is it fairly uncommon? Any replies will be appreciated.