Watch accessories generally don't have serial numbers--what you need is the part number (98000071, or 98000071L for the long variant). Any AD or OB can order it for you at cost. Last I checked though, all of the kevlar x33 straps were more than $200. If you just want a nice red strap, it'd be far cheaper to go with something like a nice hirsch strap.
Thanks for the info but my question was about the black and red nato and not the red kevlar.
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