This genuine Longines HydroConquest 39mm steel half link was removed from a new watch and includes the original Longines pin. It is 17mm wide and designed to fit bracelets on modern 39mm HydroConquest Ceramic models.
I have given you clear images of this half link from every angle. The link in the photos is the exact one you will receive.
If you are not sure if this will fit your watch or if you have any other questions, feel free to email me at Sales@TheWatchLink.co.uk. I'm happy to help!