ID Grandfather's Harmonic

Can anyone help me ID what year this harmonica is? No star in hands, 10 holes, no numbers above holes, wood base.

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That appears to be a No. 260, Hohner’s first model of Chromatic Harmonica (later renamed Chromonica) that was first advertised in 1910: eLibrary: Music Trade Review - Issue: 1910 Vol. 50 N. 5 - Page 44 | Museum of the Game

There ought to be traces of an external spring at the slide-knob end.

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