Manufactured by Industrias Salvador from 1923 to 1930.
Based at 72 Carrer Rogent and later 527 Carrer Provença, Barcelona, the company was established by Salvador Grau. Well-known for their automotive wheels, the firm constructed motorcycles of 125cc to 350cc using two- and four-stroke engines from MAG, Moser and Train, along with their own. Around 200 were built.
In 1922-23 they constructed an autociclo (cyclecar) powered by a 992cc MAG V-twin, with cardan transmission. Few were built, and there are at least two survivors.
N.B. The founders' name is given as Salvador Grau Just by some sources.
Sources: wikipedia.ca; autopasion18.com; et al.