6A/373 - A.S.I. Air Speed Indicator Mk.IVA (Cat No AVG 175) 6A/373 - A.S.I. Air Speed Indicator Mk.IVA (Cat No AVG 175)
Range 50 - 250 MPH, this is the large size ASI, as fitted to 1st WW aircraft, but allows for an increased speed range. It was designed to be fitted to 1920s military aircraft and was in use up to the mid 1930s, in such aircraft as the Hawker Audax, Hart, Bristol Gamecock, Bulldog and many other types. Converted to a capsule movement in period, they are much more reliable that the rubber diaphragm type of the 1st WW era. This instrument has now been completely dismantled and fully reconditioned, but will require check calibrating before use, which we can do. Serial No. 39893 Maker: R.W. Munro. Extremely rare. £1,950. Catalogue no. AVG 175.