The serial number should match the logo on the microphone body.

The results revealed that the microphone with the serial number "NU-XXXXXXX-1234" was indeed a U87, manufactured on March 15, 2023, as part of a batch of 200 units. Emma's eyes widened as she noticed that the serial number was sequential, indicating that it was produced in a continuous run with the previous units.

The location varies depending on the model and production era: : Usually located on the front of the XLR connector .

On vintage U87s and U47s, the serial number is stamped on the body usually etched or written on the internal circuit board.

Neumann has used several serial number formats over the last 90+ years. Understanding the format is the first step before you "check" it.