This authentic Omega Speedmaster buckle clasp is Omega reference STZ004194. It is made from stainless steel and will fit some Omega Speedmaster models with straps that are 18mm wide at the clasp end.
The clasp is in good condition and in full working order, showing only light signs of use. This will fit your watch if your clasp is stamped STZ004194.
You will receive the exact clasp shown in the photos, with clear images from every angle to help you inspect the item before purchase.
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!