OK, I have no idea what this goes to but they can't be easy to find if you need one.

http://www.ebay.com/itm/301340516366?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:ITPurchases made through these links may earn this site a commission from the eBay Partner Network

 

Some kind of Chastity Belt?

 

31 mm lugs?
Considering Railmaster XXL with 49mm case only has 24 mm lugs, then this must be for 55 or 60mm case

 

Probably for a square/rectangular case?

 

That is more make sense.

 

One of the Megaquartz maybe?

 

I'm thinking it may be for one of these or similar.

196.0023

 

The lug width is not as wide as the strap - see the spring bars? I think Norm has the idea.

 

I reckon someone is breeding these massive straps:

http://www.ebay.co.uk/itm/Vintage-O...rap-New-/301350190960?&_trksid=p2056016.l4276Purchases made through these links may earn this site a commission from the eBay Partner Network