[ Ira Prilik wrote in 140623 MMDigest --

> ... approximately 1 minute 50 seconds per barrel rotation,
> each tune between 52 seconds and 58 seconds long.

Hi Ira,  An overture box has to have a cylinder of three or more inches
in diameter and must play three to four operatic overtures.  (There
are other definitions, but that is an accepted one).  If your cylinder
plays 1 minute 50 seconds, and in that time plays two tunes each of
about 52+ seconds, then you have what is called a "Two-Per-Turn" box.

While the cylinder will be 3+ inches in diameter, the fact that it
plays two tunes per turn negates it being an overture box.  These boxes
came in both keywind and lever wind formats.

Hope that helps!

Nancy Fratti - Nancy Fratti Music Boxes
Canastota, New York, USA
http://www.nancyfrattimusicboxes.com/