That's odd. It sorta looks like a Sako dovetail rail itself on the dang scope. But that is backwards for mounting to a Sako.

From the rear and moving forward, a Sako dovetail gets narrower by 1mm for every 16mm forward it goes, or some rate similar to that off the top of my head.

But you already know all this.

It looks like the mount you will need will have to be female/female to rail mount on anything.

I'm just thinking out loud here.