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US cans have a flat, indented bottom and 3 handles across the top. German cans are two halves joined along the middle (as in left and right halves) and only one handle.
German WW2 jerrycans had 3 handles.
I believe the origin of the term jerrycans came from the fact the Germans had them first. British fuel containers were smaller boxlike things. The "Jerry's cans" were prime pickings for use by Allied troops (once they stopped retreating most of the time!!
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). The basic design was copied by the Allies. I believe early US/Allied jerry cans were virtually identical to the German ones, all the way down to the shape of the indent on the sides.
I think Rob may have described modern jerrycans, which I know nothing about!!
The old Tamiya jerrycan set is to be avoided except for some nice buckets!
The recent releases are better. As others have said, the Italeri jerry cans are the most praised items around. I don't have that set. The Tamiya old cans are pretty poopy, I have lots!