WW1 Era H H & Sons Ltd 'Pilot' Binoculars in 1914 Case

A well marked pair of blackened brass binoculars in a 1914 dated leather case, they were made by H H & Sons Ltd of London and they are marked 'pilot' but I think this is the design name, they also carry a registration number. The lenses are nice and clear but the surface shows signs of age and use and the eye pieces have been reduced in size in a rough manner, they measure 3.75 inches high.