Possibly related to the range-finding equipment sent from England for dismantling during the 1940s so University of Melbourne Physics staff could develop their own equipment. Related to object 463.1Leather accessory box with shoulder strap and metal buckles. Flip open lid.Embossed in lid: 'CASE NO 6 DETECTOR MK 1 / COOKE, TROUGHTON & SIMMS, LTD / 9 / 22 / A.F.A' and broad arrow symbol.accessory box, no 6 director mk i, broad arrow, cooke troughton and simms ltd, wwii, mathematical instrument