That's Gregus Pal from Hungary.  I bought a tenor tarogato from him a few years ago. 

Yes, that's an Eb clarinet at the front.  I didn't know he'd made one of those.  That's an octavin that he's holding.

The alto tarogatos on the left are copies of a very rare Stowasser that Scott Robinson measured for him.  The ones of the right I believe are copies of a Shunda instrument with a simpler mechanism and smaller tone holes.  As I remember, those ones only have a single octave key (like Shunda's soprano tarogatos) and are very difficult to play.

Do they use clarinet mpc/reeds?

Clarinet reeds but a different mouthpiece.  The internal geometry is very different from a clarinet or saxophone mouthpiece.  Having said that, some people have managed to modify a soprano sax mouthpiece to work.  In the UK Ed Pillinger makes them to order. János Grúber in Hingary also makes mouthpieces.

Buying a tarogato is a bit of a minefield. There are a lot of poor quality instruments out there. 

Only old Sowasser instruments can really be recommended but there are a lot of fakes about so you have to be careful.  József Tóth and the new reborn Stowasser company in in Hungary both make good new instruments.  My own was made by Stephen Fox in Canada but I had it made before new Hungarian ones were easily available.


http://www.tarogatocenter.hu/index_en.htm
https://www.tarogato.net/english.html
http://tarogato.hu/en/home/
http://www.sfoxclarinets.com/Tarogato.html
https://pillingermouthpieces.co.uk/

I'm afraid there's no chance of that happening - I don't mind knocking my front teeth out, but I ain't switching to no boehm system.

What the hell has the key system got to do with it?

Thanks for the clarification, Windsong. Now it kind of makes sense, as even whiskeys from that time in France had the same inscription on them. Had hope that it would lead to some model name or something like that, as many Buffet models have their names below the brand logo. Guess that unless some expert in old Buffet clarinets chimes in, that will be unknown...
While searching i came across more 3 or 4 similar clarinets, all from Buffet and ranging from 1898 to 1905, so it seems that still there are some of them out there.

They didn't have model names back then.  The nearest thing you might find is a catalogue number but even that isn't really a model number.

The mechanism is for fork (1+3) Eb/Bb rather than a correction key for the long (1+1) Eb/Bb.  i.e. a fingering that is not available without it.

It may or may not improve the long Eb/Bb in the lower register which is the one that is always horribly sharp.  The upper register long Bb is normally perfectly acceptable tuning wise.

Trying to work out what the label on the case says, it looks German, like Echt Vulkan Flute

It says Echt Vulkan Fiber.  Genuine Vulcanised Fibre in English.  A board material something like cardboard impregnated with rubber.  It was often used to make suitcases.  It may still be for all I know.

Another, more generic name for these is Plateau clarinet - these come in Boehm and Albert key systems, but much less common in Albert.

The Albert is a bit old fashioned, and the register key is on the side.

The material is advertised on the case - Vulcan Fibre. I would say this is between 1910 and 1920.

It's neither Boehm nor Albert.  It's called a sax fingering clarinet. The lower joint's has a fork B/F# mechanism like a Boehm but is Albert like other than that.