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The serial number of your Mason & Hamlin piano can be found in several locations, depending on what model of Mason & Hamlin you are trying to date. Mason & Hamlin Serial Number Locations 1. Model B, A, AA and BB grand pianos. First, sit at your piano like you are playing it. Then look into the piano plate and to the left of the centre of the piano. There should be a serial number stamped under the letters.

Mason & Hamlin Organ Company - Pump Organ Restorations Antique Organs America's Best Known Restorer of Antique Organs Antique Organs Pickup and Delivery Available in the USA and Canada Mason & Hamlin Organ Company This is just about all the information that’s survived the passing of time on the Mason & Hamlin Organ Co. The company was located on Cambridge St., then 277 Washington St., then 134 Tremont St., Boston, MA 1854-1888. The company was renamed Mason & Hamlin Organ & Piano Co. It was founded by Henry Mason and Emmons Hamlin with funds provided by Oliver Ditson and Henry's father, Lowell Mason.

They built about 450 organs per year from 1855-1861. Factory capacity was 10,000 organs per year by 1902. In 1905 Mason & Hamlin made a contract with Alphonse Mustel in which he would make his home in Boston and supervise the manufacture of Mustel Harmoniums by Mason & Hamlin.

While it is uncertain that Mustel ever went to Boston, twenty-five years earlier Mason & Hamlin had produced their 'Orchestral' organ which had pressure bellows, expression, percussion action and the same specifications as a Mustel harmonium. Mason & Hamlin was acquired by The Cable Co. In 1911, which which was acquired by American Piano Co.

Reed organ production ended in 1927.