George,
That was my first thought too, but it is kind of a high serial number for a 1906. I alao thought it might be an even more rare 1913 Commercial but the serial number is a bit too low. Also the "crown over an upright N" is puzzling, the vertical Crown/N is a 1920 proof. Need to see photos.
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If it's made after 1918...it's a reproduction
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