Originally this product was produced at Tequilera Newton E Hijos (NOM 1173) under the name of "Gusano Real" (as pictured on the previous page). After a short stint under this name, Zuma Imports changed it to "Casta - Worm Bottle" and at least most of this tequila was produced at Industrializadora de Agave San Isidro (NOM 1420). Now Casta is marketing all of their tequila under this new tag of "Casta Pasion" and produced at yet another factory.