Clinker launch identification

I wonder if you could help finding out the origin of my mahogany day cruiser? I bought her in Amsterdam three years ago. The owner had restored it for a decade but was not sure about her origin. He guessed she might be built in the 1940s or early 1950s when such boats were typically used for cruising in Dutch grachts and canals. The boat is now based near Berlin on the Havel River.

Winfried Meissner, Jena, Germany