Your site is great! I have a 535 omnidirectional dynamic microphone which I purchased at an antique shop. I would like info on this product. When was it produced? Where can I have it refurbished? Is it a valuable item? Is it still made today? The serial number is 6528.
The 535 had a life span of 1956 to 1967. Its final retail price was $72.50. It was designed as an interview microphone for radio and TV. Unfortunately for Shure, it was not a big seller.
Shure Service can not refurbish it. In general, we maintain repair parts for five to ten years after a model is discontinued. As to value, Shure does not collect old microphones and therefore we cannot tell you how much it is "worth". Please see the following:
Value of vintage microphones web sites