Wow, what a coincidence, there's a guy on another forum asking about the same mic
This one is likely a stumper even for our resident experts, but I make a call that it's a Calrad DM 16H/Lafayette microphone from about the early 60's. I was in a Lafayette Electronics store back in 1963 and remember that mic very well.
You might think I know a lot about mics..... nope just Google proficient , However there is a good chance I had been in a Lafayette Electronics store in 1963.