Hello Gentlemen.
Here a list of a producers of a navy daggers. If you have something to add to the list, please let Larry know. He can correct it.
Best regards,
Oleg.

Kaiserliche Marine.

AS 1848 with a crossed swords under a crown
Bartling Georg&Söhne, G.B&S under a crossed swords(distributor)
Berger&Collani(distributor)
Eickhorn Carl
Kaiser Carl&Co., CKCo with a crossed swords under a crown
Lüneburg August(distributor)
Pack Ernst&Ohlig(German Auto- und Aerocorps daggers)
Robrecht(distributor)
WKC

Reichsmarine.

Alcoso
Eickhorn Carl
Puma
WKC

Kriegsmarine.

Alcoso
Braun Adolf(distributor)
Clemen&Jung
Eickhorn Carl
Höller F.W.
Hörster E.&F.
Klaas Robert
Krebs C.J.
Lüneschloss P.D.
Pack Ernst&Söhne
Plümacher Richard Only a copies with this maker mark are known.
Puma
Seilheimer Paul No daggers are known.
SMF No daggers with a proved genuineness are known.
Tiger(distributor) No daggers are known.
Voos Emil Only two or three daggers are known. Are they original?
Weyersberg Max No daggers are known.
Weyersberg Paul
Wingen Jr. Anton No daggers with proved genuineness are known.
WKC