Model Variants (Including Prototypes)
A2E1 - Internal Vickers Designation
Light Tank Mark I - Original Designation; changed in 1924.
Medium Tank Mark I - Initial Production Model; 30 examples produced; service beginning 1924.
Medium Tank Mark IA - Improved Mark I; increased armor protection; improved bogies; revised turret.
Medium Tank Mark IA* - Rebuilt Mark Is and Mark IAs; sans Hotchkiss guns; co-axial installation of Vickers machine gun; rotating cupola.
Medium Tank Mark I CS / Medium Tank Mark IA CS - Close-Support Smoke-Laying Vehicles rebuilt from Mark I and Mark IAs; 1 x 15-pdr mortar.
Experimental Wheel-and-Track Medium Mark I - Proposed Variant; never mass-produced.