Omega Dirty Dozen, a stainless steel British military issue wristwatch circa 1940, dial: black, luminous filled Arabic numerals, subsidiary seconds at 6, calibre: cal. 30T2 manual winding, 15 jewels, movement number: 10303919, case: polished round, screw down back engraved 'W.W.W Y1921', case number.106661209, Closure: brown leather, stainless steel buckle, dimensions: 34 mm, signed: case, dial and movement, accessories: none.