I don't know if anyone out there can help identify what these rings would be suitable for? I picked them up some time ago and - if I ever knew - I've forgotten now.
They are 1" rings (both are inscribed with "25.4") and appear to be quick release. The larger of the two also has "Finland Sako" inscribed on it. As you can see, one of the screws is missing but otherwise they seem to be in good nick.
I know they weren't the same design as the Optilocks on my old Sako 75.
Once I know what they are for I'll likely stick them in Classifieds as the Sako is now history.