Joke bread roll with exploding mouse underneath

When you pick up the roll, which has been hollowed out, there is a mouse underneath. When you pick up the mouse a spring loaded banger goes off. German, in its original box. A tag on the mouse has on it #1155/B. The outside of the box has in pencil: Brötchen m/ Knallmaus (Roll with bang mouse).

Details

Size Length of roll 85mm. Length of mouse 55mm.
Date Probably middle of the 20th century or earlier.
Key Phrases
Category
Ref no N1402