Hi Dave;
The Formation Sign on her is that of the 25th Army Tank Brigade Dec 1940-Jun 1942, 25th Tank Brigade Jun 1942-Jan 1945. The Brigade served in Italy from Apr 1944 to Jan 1945. Was under command of I Cdn Corps Apr-Jun 1944 and in Sep 1944.
Problem, most of the units of the Brigade were Churchill equipped, not Sherman. Also, the AoS, 61 on Red? Anyways, will see if I can pin down a unit identity for you.
Have attached an image of the 25th Army Tank/Tank Brigade Formation Sign.
Cheers