Here's a rare item: an Electro-Voice 300 microphone clip. These shipped with the venerable 666 and 665C mics. It's made of tough plastic, with metal threads where it screws onto a mic stand.

It will fit the 666, 665C, 667, 676 and many other mics of approximately 1" diameter. It would be a great addition to a microphone on display, and of course will do yeoman's duty in the recording studio with these great old mics. Like everything Electro-Voice made in their golden age, it’s well-crafted, tough and sturdy.