Hello Peter,
From what I can read on the blade, it's an M1819, described as "Russian Form." The manufacturer's mark isn't written in Cyrillic, but it corresponds to a German manufacturer, most likely from Solingen.
This is the first time I've seen the absence of the ring on the first bail band. That doesn't seem normal to me. Usually, the "German" system at this point is the ring plus the loop along the band. If that's the case, I think it wouldn't be difficult to restore it by having a ring of the correct size welded on, especially since on German knives it's welded, not hinged in a ring.
This sword does not have the AKO 10 january 1895 modification, which consists of removing the lower band when simply set on the scabbard, or cutting the ring and removing the lower ring, to leave only a single attachment.
View attachment 73504
Beautiful Pallasch! I have the French cuirassier's M1817 captured at Waterloo, the same model but made by Solingen, and the French carabineer and dragoon's M54, captured in 1870. They are all regimented by the Germans.
Greetings from Lorraine.