Hi Gelle
I have been meaning to post a response to your question for some time, my apologies for the delay. I have a very similar, if not an exact match to the weapon you have questions regarding. It is also maker marked PDL within an oval with the blade measuring 48.26 cm in length (US 19 inches), one piece cast brass grip and guard with a simple brass oval base. It has a brass mounted, sewn black leather scabbard typical of the era and has been identified to me as a pattern intended for use by the Swiss. I have noted that various German firms provided the Swiss Army with a variety of Faschinenmesser through the years including sawback models.
In my example as with yours there are no other markings on the weapon except for the makers name. So, perhaps other countries made use of this pattern as well.
Hope this helps a bit.....
Larmo