Nothing is wrong with this CZ. As a matter of fact I believe the grips maybe original. I would leave them on the gun. The 251XXX serial range is near the end of the Bohmische slide and right before the start of the fnh slide variation. There was an overlap around 260,XXX range. We see the last 1000 E/K police contract show up in the 267,XXX to 304,XXX range. The Police contract ended in early of 1944. The fnh police guns do not bear the 44 date however, unlike the others which do have the 41,42 or 43 commercial date. However, they were indeed procurred through early 44. So, more then likely this gun was set aside in late 43 and proofed for commercial sale in early 44. As to the grip. Since this is a commcercial gun it makes sense. They would have saved the normal grips for military use and used a left over grip from stock to fulfill a commcerical request. To me this appears to be a genuine smooth Cz24 grip that was not fully checkered with the CZ27 pattern. It would make sense to use left over old stock to do this. In person you should be able to tell if you see genuine wear marks. But I have a feeling this is not a recently made grip. I like it the way it is.