My grandparents brought these knives with them when they emigrated from Germany in the 1930's. They are among my most cherished possessions and I love using them.
The large one was made by F. Widmann & Sons in Munich. It has a Bakelite (or similar synthetic) handle. Unfortunately I chipped the tip of the blade.
The middle one has the greatest small tooth serration - perfect for tomatoes - and a great handle.
The two little ones have dark wood handles (ebony?) and were (I think) part of a cake serving set.