Sennheiser MD421-N
Dynamic cardioid microphone.

Year introduced	1960
Year discontinued	unknown
Polar pattern	Cardioid
Frequency range	30-17000Hz
Sensitivity	2 mV/Pa
Impedance	200 Ohms
Weight	0.4 kg (14.1 oz)
Dimensions	49 x 46 x 203 mm (1.9 x 1.8 x 8 inches)
Material	Metal case
Features	Five-position M/S (bass rolloff) switch
Connector(s) used	DIN 41524 (Klein Tuchel)

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 Gross Tuchel (DIN 41624) connector (MD421-2), and a dual impedence version with a different pinout (MD421-HL or MD421-HN).