Sennheiser MD 421-U-4 Cardioid Dynamic Microphone (MK I), 1960, made in Germany

 

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The MD 421-U is provided with a 3-pin Cannon plug (XLR). It is, as the other two models, a low-impedance microphone which is symmetrically wired. A roll-off filter is provided. Two versions of the MD 421-U are available: MD 421-U-4 with adapter for 3/8-inch threads and MD 421-U-5 with adapter for 5/8-inch x 27G threads. The MD 421 N and the MD 421-2 are available in light grey heavy-duty finish. The models MD 421-U-4 and MD 421-U-5 feature a mat-black housing.

Sennheiser MD 421-U-4

The -U means it has an XLR connector.

The -4 - that it is a black version and denotes the stand thread (3/8" standard thread).