Hi Deno14, I think that the serial number of your watch dates it to circa 1943. It is quite likely a (post war) recased military watch, either a 6B/159 or an HS8, both of which could have originally been housed in a ref 2292 duraluminium (or whatever that alloy was) case during service. The dial and hands look to be as original for military. The Dennison 13322 is a very good case that Dennison made from circa 1939 right up to circa 1960 in many metals, silver, 9ct gold, stainless steel and plated and cased up Omega, Longines and SmithS watches among others. I am sure that there are other that know more but that's my thoughts. Nice watch
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