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I'm not familiar with this European brand. Are they still in business or is it a legacy brand? Are their newer horns Chinese stencils? Quality comments?

It's Marigaux.

A few decades ago, King Musical Instruments imported the oboes, English horns, and oboes d'amore... also the clarinets and saxes.

You can see pictures of the old King-imported instruments by typing "King Marigaux [type of instrument]" into your search engine, and then clicking on "IMAGES".

https://en.wikipedia.org/wiki/Marigaux

I vaguely recall that SML label saxophones are esteemed rather highly, or were a couple decades ago anyway.

One of the early model Jinbao travel F tubas -with that brand engraved on it - appeared for me on Reverb, as I've been keeping an eye out for a used china travel f/tornister. I would venture a guess that all their brasses are imports