copper-alloy Type \'A\' sheath

[LUCIUS ALFENUS AVITIANUS]

Regarding "double disc" handles, I find this term a little confusing, as it made me first think of the other type of native Spanish dagger which had a pommel in the form of two discs side by side and whose sheath had a matching terminal expansion in the form of two side by side discs. It took me a moment or two to realise that the "double disc hilt" referred to was the early form of the familiar handle used by the Romans which featured a central expansion and a circular pommel expansion.
Crispvs

What kind of dagger is that?

There are some daggers with a 4 disc pommel sheath, but the handle is in form of a T.

http://www.ffil.uam.es/equus/warmas/tipolog/22.jpg

There are richly inlay in silver, with motifs even more complicated than roman ones.