Photos a bit fuzzy but M4A2? marking with the 30 is on a flat panel and on an A2 its more rounded on the edge but the other side of the tank is not in shot.
Among many others, these companies are just a few that I know who made the Sherman:
Lima Locomotive Works
Pressed Steel Car Co.
Pacific Car and Foundry Co
Fisher Tank Arsenal
Pullman Standard Car Co.
American Locomotive Co.
Baldwin Locomotive Works
Federal Machine and Welder Co
I can agree with dutchy that it is most likely the M4A2 'Sherman' from 1942.
Here is the picture which I improved a bit:
This version was produced by a number of companies:
- Fisher Tank Arsenal
- Pullman Standard Car Co.
- American Locomotive Co.
- Baldwin Locomotive Works
- Federal Machine and Welder Co.
As Fisher produced most M4A2 I suggest to use that name.
the "30" is in black on a yellow circle..thats the bridge classification plate for crossing bailey bridges...this mark indicates the tank to be British crewed..the US didnt have this marking.