I have an AP Royal OAK 4100 with a broken stem. Can't find a replacement stem, but I have read that the 2123 movement is shared with JLC, Vacheron Constantin and some IWCs? Specifically:
-Jaeger lecoultre :889
-audemers piguet 2123
-vacheron constantin 1126
-Iwc cal: 3256 -A3252
So if I find a stem for say the JLC 889, should work with the AP?