I knew the scope repair technician who contracted with Sarco about 15-20 years ago. Sarco had bought hundreds of broken/incomplete scopes, as well as parts, & his job was to assembly as many complete scopes as possible. Prior to the contract, he had a bucket full of demilled M84's (cut in half) that he used for parts; I don't know if he used the name plates from those for the Sarco project, but he did have quite a few unnumbered plates that were included with the Sarco parts. Eventually, Sarco parts scopes ran out, & high demand led them to contract for Chinese reproductions. I've never examined one of their Chinese scopes, but would assume that they are more crudely made than the original Libbey Owens Ford scopes.
Neal
Sarco advertises as original unmarked plates from the oem manufacturer. Could be the case. Scopes looked good up close but didn't play with them to see if they worked well.