You have a nice and original SA-dagger by Merten.
The dagger is all fine and in pretty good condition, the scabbard is original but incomplete and the upper fitting got damaged.
You can try to find the missing scabbard piece, but try the fit before buying, because those early ones are not standardized.
You made a good start to a dagger collection, congratulations!
Herman
Thank you very much, and thanks for the info. I much prefer the early model daggers, they seem to age a lot better compared to later models.
