This listing is for an original James Millen Mfg. Co. shaft lock, model 10061, designed for 1/4" shafts. This is a New Old Stock (NOS) vintage radio component still sealed in its original packaging.
The part is sealed in the original bag. Packaging shows some age wear consistent with long-term storage, but the component inside is unused and preserved.
This is a great piece for vintage equipment restoration, ham radio projects, and collectors of Millen hardware.