This is a compatible pin and two tubes designed to fit Omega Seamaster Fullsize watch links. If the back of your end link (the part that connects your strap to your watch) has the number 825 on it, or if the last three digits of the code on your clasp are 825, then these will fit your watch. These were not made by Omega, but they are high-quality compatible parts.
If you have any questions or need assistance, feel free to email me at Sales@TheWatchLink.co.uk. I'm happy to help!