I have worked for a period of 20 years or more with the theme: " The Stralsund-Sabre", and have not yet been able to entirely crack the case. I am close, but there are still a few unsolved questions about the origin of this hanger.

Let me start with pointing out that the name: "Stralsund-sabre" is a bit misleading. It was invented by a Danish collector some 60 years ago, as this sabre or hanger was supposed to stem from a Danish war- booty taken from the Prussians at the battle of Stralsund, where a combined Dutch-Danish army fought against the Prussian commander Schill in 1809. He was killed and his troops entirely defeated.

The Danes lacked uniforms and weapons before the battle and may have been supplied by the Dutch army, though this has not been been officially recorded .

This hanger was well known in Holland around 1800, where Grenadiers, both privates and NCOs, were equipped with it.
Denmark bought c. 2.000 in 1808 from a German merchant. They were later introduced to the Royal Danish Navy and also to our Artilleri. This hanger is well known here in Denmark and can be found wih one, two or even no extra guards. It was still in use in 1871.

Now over to your question. The marking on your scabbard is definitely not Danish. I read it not as a double C, but as an H. The letters P. I. I cannot decifre. P for Pioneer is an obvious first choice, but it might also stem from an unknown volunteer group.
...

Always at your service.
Greetings,
Erik Troldhuus
Denmark.