Teisco UDM-104 in OG Box

1966 High Impedance uni directional dynamic microphone with on/off switch. Small Switchcraft like connector (optional  Switchcraft screw on connector 2501M or guitar plug).

I found this microphone to be a big secret! Never saw anyone play this as a harp mic and I don't understand why not!

Beautiful balanced characteristics. Nice deep lows and a dirty crunch. Great output! This thing rocks! Very easy to cup. The top of the mic is closed airtight from the lower part. This makes it unidirectional and very easy to cup and hold.

Looks a lot like the Shure Unisphere 585