Dr. Prosperi
Your information is a bit of a puzzle. The photos are too small to determine any detail. You state that the toggle knobs are dished, which would indicate a Model 1900 as Tom guessed. However, the serial number falls well within the Model 1906 range as Dwight indicated.
Does the right side toggle knob look like the following photo?
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If it's made after 1918...it's a reproduction
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