The image shows an aircraft altitude and differential pressure indicator (UVPD).

This combination instrument is designed to measure two important parameters in the aircraft cabin:

Altitude: The upper scale indicates the current altitude in a pressurized cabin (barometric altitude).

Differential pressure: The lower scale measures the difference between the pressure inside the cabin and the atmospheric pressure outside.

Main characteristics of the model:

Type: Most likely, this is the UVPD-20 model (or a modification of the UVPD-15), widely used in Soviet military aviation, for example, on MiG and Su fighters.

Materials: The housing is made of bakelite, with metal and glass used in combination.

Period of production: USSR, circa 1960s–1980s