Leningrad Institute Of Aviation Instrument Construction Badge

[KDVR]

who knows more about it. thank you ;-)

[Al-muell]

My guess (not suported by anything) from the letters:
Flight institute of the Air Industry.

[Pobeda45]

Yup, it's a badge to a graduate of the Leningrad Institute of Aviation Instrument Building (Ленинградский институт авиационного приборостроения). It still exists, with the official name Saint-Petersburg State University of Aerospace Instrumentation.