4 T1 Variants from top to buttom
T1 (1926) Cunningham (sloped turret, short gun, early hull)
T1E1 (1927) Cunningham (sloped turret, short gun, late hull with catwalks)
T1E2 (1929) Cunningham (cylindrical turret, short gun, late hull with catwalks)
T1E3 (1930) Cunningham (cylindrical turret, long gun, late hull with catwalks) – up gunned T1E2 modification
ALSO it is possible to assemble
Upgunned T1 with early hull and late turret with long gun
and
Modified T1 with ealy hull and cylindrical turret with short gun
But they are not listed on QRF site yet :)
Here you can see how upgunned T1 (long gun and early hull) compares with 15mm Peter Pig WW1 Brits