Ration Box – Tank crew – HSA 1943

British/Canadian WW2 tank crew survical ration intended to sustain five men for one day. The metal box is maker marked H.S.A. and dated 1943. The text is not good readable anymore, it says RATIONS / No.3 – 5 MEN 1 DAY. Measures  26 x 26 x 16 CM. Hard to find ration box, complete with its original leather strap.