Help ID this camera mount

Hi there,
I recently got this relay lens for a night vision device and I am trying to figure out what camera is this mount suppose to go ? Anyone has any idea ? I am guessing it may be a K-mount but I don't have any to compare it with.
Thanks in advanced.

 

A bit of Googling brings this image:



Looks different to me. Probably isn't a standard mount.

 

It's hard to tell scale in the photos, but it looks bigger, and bulkier than typical bayonet, camera mounts. What is the nationality of the night vision device manufacturer?

 

It is an American company called OST. I've tried to contact them but got no information back.

 

Check

http://rick_oleson.tripod.com/index-99.html

 

Looks pretty similar to the "Petri SLR" mount featured in the link posted above minus the diaphragm and meter indexing.

http://rick_oleson.tripod.com/lensmounts/petri.jpg

 

I don't see tabs (bayonet style) or threads on the lens. I'll bet it's not a standard mount and is a proprietary system. Hard to tell from the pics though.