Original version, based on the Guy Armoured Car body. Armed with one 15 mm and one 7.92 mm calibre Besa machine guns. Three man crew: driver, gunner, commander. About 300 units built.
Mark I AA / Quad AA
The Mark I fitted with a different turret mounting four 7.92 mm BESA machine guns able to elevate to near vertical and an AA sight. The vehicle was intended to provide anti-aircraft support for armoured car units, but the Allied air superiority meant they were needed less and less as the war progressed.
Changes to the turret, better armour around driver and radiator. 440 units built.
Mark II OP
Observation post vehicle, armed with two 7.92 mm BESA MGs.
Larger three-man turret with provisions for a wireless operator freeing up the wireless operation tasks of the commander.
Equipped with the US M5 or M6 37 mm high velocity gun in place of the 15 mm BESA. The larger gun required the removal of the third crewman in the turret (the wireless operator). Turret hatches were rearranged with the new gun and crew layout. About 2,000 units built.