Maybe Rohl.
The three similar I have dealt with, Rohl sent free full replacement faucets because they don't take to repairs well whatsoever! Only for the rich, who can afford a service call every time they age for a few years.
Rohl is overpriced junk and if it is a knockoff, that is worse.
The ring under the lever will come loose if you are very lucky and use a non marring strap wrench, but do not bother buying one because the faucet is a throw-away unless Rohl gives you a new one.