Spy Gadgets in World War II: Exploding chocolate bar

Here's one bar of chocolate that you wouldn't want to eat!

This ordinary-looking bar of chocolate is really a German hand grenade. It's made of steel with a thin covering of real chocolate. When the piece of chocolate at the end is broken, a strip of canvas is pulled out. After seven seconds the bomb explodes.

A drawing of a German hand grenade disguised as a chocolate bar

Who did this belong to?

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