I liked those so-called "Thekenbeschläge" (is there an established English name for those?) since I first saw them and espescially this one with the ring-pommel sword and beneficiarii standard incorporated. This may mean that it was once owned by a beneficiarius.
The original is massive silver, my reproduction is tinned brass. No traces of the scabbard itself nor of the knife it once held remain. The scabbard form and straight bladed knife (after a find from London) are hypothetical in this combination.
Relatively little is known about this kind of scabbard decoration. It comes into being some time in the 2nd cent. AD. There is no complete find, so we do not know what a scabbard would have looked like and only one find togehter with the remains of a knife, with a straight blade.
Flügel, Christof. Ein silberner Thekenbeschlag mit militärischen Motiven. In : Dedicatio Hermann Dannheimer zum 70. Geburtstag, Kallmünz 1999, 116-122.
Ludwig Berger: Durchbrochene Messerfutterale (Thekenbeschläge) aus Augusta Raurica. Ein Beitrag zur provinzialrömischen Ornamentik, 2002. 122 Seiten mit 113 Abbildungen, 10 Tafeln und 7 Karten (Forschungen in Augst 32)