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Re: UNIDYNE MODEL 55C
This is a model of Shure Microphones that is still being sold. A new one with a warranty can be had from Sweetwater music for about $250.00. There are several modern variations today. Your "C" model is a high impedance model but it does not appear to have a switch. They might be too common to be "collectable" but they are a nice object of art. If yours works as it is, it could be useful for public address system use but with no switch, it would have to be controlled at the amplifier. Some people use these to record vocal tracks. However, there are many more contemporary microphones for that. Here's a link to more information:
http://cdn.shure.com/brochure/upload/77/shure-the-unidyne-story.pdf
Here's the owners manual linkL
http://cdn.shure.com/user_guide/upload/487/us_pro_55a_ug.pdf
Walter Price