I'm requesting help in identifying this plate that came with a used lens purchase. It was attached to the lens collar of a 100-400L that I ended up selling, but forgot about the plate until I was cleaning out my photo accessories box. I'd like to list in in the Classifieds sections, but I have no idea how to list it. It is void of any markings that would indicate a make or model. My guess is that it's generic, but I've done some quick searching on the web and have found dozens of plates, but none that looks specifically like this one. I'd appreciate any help in identifying it so I can figure out how to price it accordingly. TIA!