Accordion Links: Manufacturers and Brands

Colombo & Sons from San Francisco was founded in 1927 by Colombo Piatanesi (who was previously co-owner of Guerrini) and his two sons, Gary and Faust. From the late 1930s they imported the less expensive models from the Piatanesi family in Italy; in 1954 production in the USA stopped, and all accordions were imported from Italy.

http://accordionlinks.com/manufacturer.html