Stamp on soviet officers cap.

[Dimitri]

Can anybody translate цзпк or tell me what it means. It is on a soviet general officers cap that I have and has puzzled me for a long time. Thanks - Dimitri

[Dimas]

Probably ЦЭП ? If so, Tsentral experimental factory, most of the uniforms for highest officers was made by this factory, also that factory produced other headgear too
Picture of the stamp is best , to get a better answer