Well, it had to be either French or US. But, all the French pre-war through 1940 vehicles had multi-piece hulls where they were cast. The Ram and Sherman, likewise, had multi-piece hulls. That leaves the T-28 Super Heavy Assault tank and the M-26 Pershing. I would suspect it to be the M-26. All of the follow-on Patton series had one piece cast hulls through the M-60.

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