Help with trigger ID

[Toscano]

I acquired a trigger which was described as coming off an FN Supreme mauser action; I had planned on placing this assembly on my 6.5-06. Do you recognize this unit? It has a spring plunger on the right side and instead of the standard Mauser yoke for the pin it has a recess. It also seems as if the housing screws into the receiver. I've looked at FN's and they seem to have a totally different system. In your opinion, does this seem to be a unit which is to be fitted for the individual receiver? Any information would be truly appreciated.
Here is the link to the photos

http://s123.photobucket.com/user/Capannorese/library/Trigger%20ID

[ar15barrels]

If that even sits in the right position on a Mauser action, its definitely some sort of aftermarket setup.
It looks to attach with two screws.
The crescent cut would be to clear the piece that hangs down on the Mauser action where the normal sear pin goes.