Kohlert. They made contras, too. Pre-WWII.
Beaugnier. No contras, but the basses were nice looking.
WA Stowasser. German. Contras, too.
A. Sax.
In C, too.
Almost forgot (duh): Evette-Schaeffer, Buffet-Crampon. Contras, too.
Pleisson (I think). Couesnon, maybe. Pierret, probably not. Leblanc didn't. SML didn't. Dolnet didn't.
Martin basses were almost always Conn stencils. I'm still not ruling out that there MAY be one or two actual Martin-made basses out there, but I think it unlikely. King (HN White) definitely didn't, although they may have had at least one prototype (they did have that sopranissimo). Holton did have basses, as well, but I believe all those were Conn and/or Buescher stencils, as were Lyon and Healy, York and others.
BTB, and just for sake of completeness, the recent Orsi contras were sold in the US under the LA Sax label.