This is an authentic used Omega NATO black and grey watch strap that comes complete with the original buckle. It is Omega part number ZSZ002027 and will fit a watch with lugs of 20mm or 19mm. This strap is used so there are some scratches. Please see the photos I have given you.
The strap is security etched "ZSZ002027 50 IJC Stainless Steel" and the underside of the buckle is security etched "Stainless Steel 94512002 11 HJB"
I have given you photos of your watch strap from every angle. Please use them to add to this description.
If you have any questions then please contact me at Sales@TheWatchLink.co.uk. I'm here to help you.