I have three of these and did some research to find out what the deal was. The 91197 was a over-run of a military order. Only 160 extras in which 140 where imported. They turned out to be nickel plated stainless for the high polish look and better corrosion resistance. Gun stainless really isn't that corrosion resistant like surgical stainless. Both the stainless P-01 and 75B fail a magnet test because they are gun stainless with higher iron. A guy posted a 91197 after shooting it until the nickel wore off on the inside frame rails and it was stainless under the nickel. The 91197 might turn out to be the rarest CZ ever imported. Most CZ fans don't know they exist.