Vintage 1950s RARE RCA BK-1A pressure microphone with case.

This is a very nice, clean and working RCA Vintage BK-1A Pressure Microphone. It is housed in its original carrying case with a 30' original, unused and un-terminated cable. I temporarily connected this mic to a standard XLR male and tested it with my professional audio system. It sounded as if it had just been manufactured (like new). There are a few small blemishes on the body of the mic which are due to being stored unused for around 50 to 60 years. The case is like new and includes the original warranty card and factory checkout list (List of contents). Also included is a photocopy of an RCA factory data sheet.
As you can see from the photos, this mic is in excellent condition considering its age. The RCA logo on the mic is the latest, newest logo used by RCA. They are also used on the newer BK-5B mics.
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Thanks for looking and good luck bidding.