I have a 24" Polyphon upright music box (coin operated).  Like many
upright Polyphons, there is a hole drilled into the side of the case
and an "override" mechanism pushing down the coin arm and playing the
box.

I've seen old mantle box keys used to operate the override through the
hole.  Does anyone know what the original key looked like?  Otherwise,
does anyone with a non-coin operated Polyphon upright have a picture
of the device used to start the tune (from outside of the case)?

John Kane