Long ago, Redfield made really good rifle optics. One of the models they made looked a lot like a Unertl/ exteral adjustment riflescope. It wasn’t though, it was a internal adjustment target scope that used rings like any other 1 inch tube internal adjustment optic.
I’ve only seen two or three of these myself in person. The glass is very clear and it’s a good optic. The first one I ever ran across was on a Winchester Model 54 varmint rifle.
Above it is mounted to Winchester model 52. The most excellent rimfire rifle ever made.
I bet from further than 10 yards most of you would assume this optic would be a Unertl style scope.