I did mike it at the muzzle. When I get my casting material ( 1/2 Lb of Cerrosafe) if I have enough, I will cast the shotgun chamber as well. I posted additional cape11-18 pictures of the scope to my cloud link. I see no other markings on the scope other than what is on the top. It has interesting "cross hairs" not a standard pattern.

http://hutch2.tonidoid.com/app/websharepro/share/capegun/

Hutch