Mike, I think it was one of many mods that Shermans might have had applied but other events removed the need.
The US vision cupola, fitted to new build Shermans from mid to late 1944 was not a direct comparison as it did not rotate.
There was an intention to retrofit earlier Shermans with loaders hatches, it's mentioned as a future mod in the August 1944 Vehicle Pamphlet.
I suspect the British vision cupola was a rare sight in Sherman.
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Adrian Barrell
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