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Drill
"Cartridge S.A, Drill .5 inch D Mark I" was approved in October 1932 and shown in LoC Paragraph A.7358 for Naval service. In September 1938 that entry was cancelled and Paragraph B.1757 approved the D Mark I for both Land and Naval service to Design DD/L/5509/I. For naval service the design was later replaced by NOD 6325 and in January 1945 both designs were replaced by DD/L/12699.D1.The .5 inch D Mark I utilised a brass case, chrome plated, with three vertical flutes and an empty cap chamber without anvil or fireholes. The flutes and cap chamber were painted red.The bullet of the D Mark I was unique and had a cupro-nickel envelope with an aluminium core and weighed 380 grains. It rested on a wood distance piece in the case.The headstamp included the code "D I" and was undated. Naval issue rounds usually had the additional code "N" and some had an asterisk added.A relaxation of the specification during WW2 allowed a plain brass case without flutes fitted with a service bullet.The D Mark I was declared obsolete for Land service in August 1948.Left: .5 inch Vickers Drill D Mark I headstamped "R/|\L D I N".
.5 inch Vickers Drill D Mark
.5 inch Vickers Drill D Mark I, plated for Naval service.Dummy
"Cartridge S.A, Dummy .5 inch U Mark I" was approved in October 1937to Design DD/L/6101 and shown in LoC Paragraph B.2046 for Land and Naval service dated November 1938. For naval service the design was later replaced by NOD 6325 and in January 1945 both designs were replaced by DD/L/12699.U1.The U Mark I had either a white metal case or a chromed brass case without cap, anvil or fireholes.The bullet had a cupro-nickel envelope with a lead core and an aluminium tip filler. It weighed 580 grains and rested on a wood distance piece inside the case.The headstamp included the code "U I"The U Mark I was declared obsolete for Land service in August 1948.Right: .5 inch Vickers Dummy U Mark I headstamped "R/|\L 39 U I".
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