I am now in need of two original stainless steel Longines crowns that fit a 12.68z movement. I believe a 12.68n would have used the same crown. I need them for two 35mm steel cases and can share reference numbers if it helps, although I believe the same crowns were used across these references. Here’s the story on one of them in case you’re curious. See below for what I believe are the correct (approximate) dimensions as well as some photos of another one in my collection. Diameter: 6.7mm Thickness: 1.8mm Stem: 1.1mm