Mama duck and ducklings

I found this in my great grandmothers attic. It is a pull toy and when pulled the mama duck moves her head up and down. There is a slot in front of the two baby ducks where I think another baby duck went. I'm trying to find a reference picture so that I know for sure! I think it I think it may be German, as I have seen a similar item (mama &papa duck) on eBay. That makes sense, because my great grandmother came from Germany.