Highly sought after cult microphone regarded as superior to the modern MD421-II. Very versatile and almost impossible to overload.
There is also an XLR version (MD421-U), a version with a Klein Tuchel (DIN 41624) connector (MD421-N), and a dual impedence version with a Klein Tuchel connector that is wired to a different pinout (MD421-HL or MD421-HN).