NEED Info on American Microhpone Co. D4 mic

[Jan N0JR]

Does anyone know anything about, or have any printed information about,
the American Microphone Co.'s (Pasadena, CA) D4 microphone?  Dynamic?
Hi-Z? Freq. response?  When made?  Cost? etc.?  I'd appreciate any
information you might have--or leads to some.  Tks es 73!  Jan N0JR
--
Amateur Radio since 1958
5BWAZ, 5BDXCC, DXCC Honor Roll=337

"Without CW, it's just CB."