One piece bakelite power connector, NOS
Used in Microphone, Microphone Preamp, Multi-Effects Processor Neumann power supplies (for example Neumann Gefell N61 or N61V, some later models of Neumann NU67, NN48b or NSMa), Dynacord Echocord-Super, Klemt Echolette M40, M80, BS40 or NG51 amplifiers, older studio hardware from EMT (EMT 156 for example), Klein & Hummel, older synths etc. Power Amplifier, Single-Effect Processor, Speakers, old products Dynacord Eminent 2 amplifiers
Who needs it, there is a mating part of the connector to the panel, write if necessary.