The Type AB

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Issued in 1901 at $25.00, the AB is also called the "MacDonald", as a 5" slip-on mandrel is used over the 2" regular one to play also the Concert cylinders, an invention credited to him.  Note the 14" Columbia aluminum horn not often found.

 

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From "The Amusement Supply Co.", 85 Dearborn St., Chicago catalog.

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