The Columbia Graphophone BO
The Columbia Graphophone Model BO, called the "Invincible", is a rarity from 1906. This machine has a 6 inch long mandrel to play the "Twentieth Century" 3 minute cylinders. The 6 inch cylinders were a market failure and were short lived. This machine features a rear mounted nickel plated horn like Columbia's disk players. It is also fitted with a 2-4 minute speed adjusting lever, rare on Columbia machines.
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