Williams "Fool proof" FP-FN peep sight for Mauser + box

I'm open to REASONABLE offers.

Williams FP-FN peep sight. Believed to be made for FN98 Mauser receiver and a few others of similar dimensions. Do your own research please. Plenty of info available online.

The box says "98", the sight says "FN". I think this is the only Williams FP model that would fit Mauser anyways, so "98" sounds about right.

What you see is exactly what you get, no less no more.

Can ship for another $20 in prepaid box.

Thank you!