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Colombo & Sons was founded in San Francisco in 1927 by Colombo Piatanesi 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.
If your accordion is in excellent condition, both cosmetically and functionally, its current retail (replacement or insurance) value is approximately $1,500. If you were to sell it, you could expect to get the fair market (private sale or auction) value of approximately 40% of the retail amount, or $600.
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