Unknown Grips

Like the title says. I have a set of unknown grips. A friend thought they were for a S&W but that didn't work so sent them to me. I have quite a few revolvers but nothing these fit. I have tried to find a set that look like them on eBay but no luck there either. They sort of look like the grips on a Taurus Judge but different. Just hoping someone on the forum has seen such a pair. Thanks

Contender?

Ruger double action revolver?

Not Redhawk or security six. They have grip screws near the middle and contender grips don't have a screw in the side. But thanks...

Appears to be for a Ruger GP100 / Super Redhawk
If you had Hogue one pice rubber grips there was an adapter that hung into the large locating holes for a single screw at the bottom of the grip.
Two piece grips would have a metal cylinder that would fit in that locating hole toward the bottom of the frame.
Have owned both.
My opinion from the photos 

The screw seems to be slightly different position and slot near top is different. The screw can probably go thru in a bunch of different places and still work and that notch might be twice as big as needed. Now I need to find a GP100 to put them on.. Thanks