Gauge, Vacuum

A brass vacuum gauge with a glass face to it. It has a scale of numbers on the outer edge of the face plate, that range from 0-30 in increments of 30. There is a metal movable arrow in the centre. There is some information written on the face plate, "VACUUM GAUGE THE ORTH EASTERN MARINE ENGINEERING CO (1938) LTD WALLSEND-ON-TYNE AND SUNDERLAND INS. OF MERCURY". There is a small threaded pipe coming out of the bottom of the gauge. The reverse is a black colour, and there are three small holes on the back edge of the metal body.