HELP - Peep Sights

[maple leaf]

A buddy has an old dovetail peep sight and does not know what it originally went to, nor doe he have the mount for it. He wants to mount it to a shotgun. It is marked "69", "100" and "200". It appears to fit 11.5mm, 60 degree dovetail and approx 13mm wide overall. Any help in identifying what he may have is appreciated! Thank-you

Pictures: http://imgur.com/a/7iqa5

 

[Keithjohn]

I would say it's for a sako rifle

 

[dryfire]

Keithjohn wins a kupie doll. Sight was an option for various Sako models - fits on the rear receiver taper dovetail.

 

[maple leaf]

Thanks for the help!