Pilot's and Flight Engineer's Notes Halifax III & IV, AP1719C&G-PN MiG-21 The knob rotates the face

The knob rotates the face of the instrument to correct the scale

Here is a 1940-50s-era dual engine Fuel Pressure Indicator made by Edison PN 34955

The fields on the data label do not contain data

It has the original crown symbol of the Air Ministry on the back

as the case has a label as a torque indicator

Pilot's and Flight Engineer's Notes Halifax III & IV, AP1719C&G-PN MiG-21 The knob rotates the faceThis is a post WWII Air Data Publications reprint of the October 1944 Air Ministry Publication. Includes checklist, airplane handling, emergencies, foldouts of cockpit pictures and instrument panel. This ~50 page black and white manual is in very good condition. Measures 7. 5 inches long and 5 inches wide.