Royal Vallet
Not a mezcal producer, a Mexican bitters producer and since many of these bitters are served along with mezcals and tequilas they’re included here.
Royal Vallet has been in business since 1882 when French entrepreneur Henri Vallet founded the company in downtown Mexico City. It has been around for more than a century producing iconic bitters (aka amari) like Fernet-Vallet and Fernet-Amargo.