Right guys whats this for please.
Been in someones collection for 40 years but dont know what its for, it measures 3 and a half inch long by almost 1 inch wide . One of the arms is slightly smaller than the other .
It has a number 3 on both arms, "EYRS BOMBAY" on one arm and the war department arrow with a capital I under it on the other . Its brass plated (wearing off )...........