WWII Boost Gauge +16. Boxed dated 1940

Very nice boxed Boost Gauge MKIII.G. Stores reference 6A/789, serial number 20399/40 and reads to +16

This type of boost gauge was fitted to Spitires, Hurricanes and early Lancaster Bombers. This particular one has a service date of 1942 marked on the back. It is in good condition but would need to be professional assessed before future use in an airworthy aircraft.