Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 137,287 pages of information and 220,285 images on early companies, their products and the people who designed and built them.
of Station Works, Wakering Road, Barking, Essex. Telephone: Rippleway 4054. Cables: "Sestrel, Barking". London Office: 71 Leadenhall Street, EC3. (1947)
1937 Aeronautical instrument makers. "Sestrel" Compasses. 
1939 See Aircraft Industry Suppliers
1947 Listed Exhibitor - British Industries Fair. Manufacturers of Nautical Instruments, Compasses, Clocks, Binoculars, Telescopes, Thermometers, Sounding Apparatus, Aircraft Instruments, Signalling Equipment, Meteorological Instruments, Barographs, Thermographs, Aneroid Barometers, Sextants, Yacht Equipment, Navigational Instruction Equipment. (Olympia, Ground Floor, Stand No. E.1799)