Bgy57 comes in from nowhere (he's new to me, anyway) and nails it.
An incomplete Sprengbombe Dickwandig 2kg, better known as the Butterfly Bomb. Stop laughing like teenagers you immature weenies.
I was prepared to offer up this hint, and then this one, and finally this one, if needed. But it wasn't. We have a reader who knows his obscure WWII German bombs.

We were so impressed with it - we copied it ourselves.
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