The Mk 1 tank was 26 ft long, 8 ft tall and 14 ft wide including the sponsons. There were 2 versions, a male and a female, and this designation was based upon the armament they carried.
A Male tank carried two 6 pounder (57mm) quick fire guns and three 0.303 in Hotchkiss machine guns.
A Female tank was armed with four 0.303 in Vickers machine guns and one 0.303 in Hotchkiss machine gun.
Both variants weighed approximately 28 tons although the male was a little heavier than the female. The engine produced a whopping 105 hp which meant it had a power to weight of 3 ¾ hp per ton. A Challenger 2 Main Battle Tank has a power to weight of 20 hp per ton.