This authentic Omega 98000280 black rubber watch strap was originally made for the Omega Speedmaster HB-SIA Solar Impulse model 321.90.44.52.01.001. It will fit the 45.25mm titanium Speedmaster case and other similar models.
This strap is in good condition and I have given you clear images of the strap from multiple angles to help you see the quality before ordering. The strap in the photos is the exact strap 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!