The armor of the Matilda could hold its own against the 37mm of the Mk III ausf E, but could be knocked out by the higher velocity gun of the Mk III ausf H which had a 50mm L/42 gun. The J(which the British called the Mk III Special) and the L had a 50mm L/60 high velocity gun which was more than a match for the Matilda's armor.
KingTiger
P.S. Does anyone know how to post pics on this site?
Achtung Panzer!
Colonel General Heinz Guderian