The Shure 585SB low impedance Dynamic microphone is an amazing mic made in the 60's.
The Unisphere A microphones were dynamic microphones who's main calling card was a very effective filter that provides excellent protection from wind and "pop" (explosive breath sounds). They help overcome poor acoustics or where wind creates a problem, such as during outdoor events. These microphones will, in almost every instance, eliminate annoying feedback. In addition, they will prevent boominess that sometimes occurs in partially-filled venues.
To get all of this modern functionality and mojo from a vintage mic goes to show what a sick mic this was and is.
This one is lightly used and works great, though it does not come with the original cord. But it will ship the next day in the included pouch.