I have to disagree.
Arca Swiss is still in business, has new models coming out. They just moved from Switzerland to France a few km away from their previous location.
I'm told they will soon have a web site ;-)
In the mean time look at the Misura ... one of their latest models..
While I'm at it, I particularly enjoyed the manual to CLA a Norma put on the WEB by Philip !
I'll thank him a lot for this tremendous job !