This is a Beyer M550 microphone which has been in my desk drawer for years. I can't remember where I got it or if I ever used it.
If you think this could be of use to you let me know, otherwise it will end up in the wheelie bin :(
Collection only from Upton, thanks for looking.
Vintage Beyer Microphone (Upton CH49)
This offer has been gifted to someone and is no longer available.