This is a compatible pin and tube designed to fit Omega Speedmaster watch links that are 16mm wide. If the back of your end link (the part that connects your strap to your watch) has the number 850 or 825 on it, or if the last three digits of the code on your clasp are 850 or 825, then these will fit your watch. These parts are not made by Omega, but they are high-quality compatible parts designed to match the specifications for seamless functionality.
I have provided detailed photos of the pin and tubes from every angle—please refer to them for a closer look.
If you have any questions or need assistance, feel free to email me at Sales@TheWatchLink.co.uk. I'm happy to help!