These are not possible to date.
They are variants to be found in the types of pressings, but they all serve the same purpose and fit the same weapon.
You can look up the WaA marks.
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Thanks for this information.What is the scientific name for this container, if there is a scientific name?
Detachable box magazine is the proper term. Though it's usually just called a magazine. More details here: http://en.wikipedia.org/wiki/Magazine_(firearms)
A bit more info on MP40 mags here at this site...