Identifying/Conserving a Kaskara from the late 60s or earlier

[dbpro]

I appreciate everyone's comments. I think I'm going to try the Rust Eraser and/or the Ballistol as suggested. I would be interested if anyone had any insight on the human head etching attached. Most of the rest I recognize from other Kaskara posts. I've attached an "enhanced" image that has been rotated.