This is an authentic Omega Seamaster ladies clasp end link, used to connect your strap to the clasp. The part is 13mm wide and marked with Omega reference number 118ST6502. It will fit your watch if your clasp is stamped 6502/830.
I have given you clear images of this clasp end link from every angle. The clasp 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!