I have three of these little, flexible, double-sided records --- one is
transparent blue, one is
transparent green, and the other is
opaque black. A friend has one in transparent green also (which has different matrices than mine). I've observed two distinctly different label styles and a least four different recordings/matrices on the records I've inspected.
I believe these were produced by one of Jesse J. Warner's companies, which produced records from 1920 until 1939. Among the labels produced by Warner were: Flexo; New Flexo; Unity; and a variety of promotional and private records. Over time, Warner's offices were located in: Canton, Ohio; Kansas City, Missouri; and San Fransisco, California.
Another related, single-sided record (attached to a postcard --- see pic below and
https://www.worthpoint.com/worthopedia/ ... 78-1996076 ) advertises another instrument sold by Mussehl & Westphal. The name of the instrument was the
Slide-Trumpet-Sax, and the triple-belled instrument resembled a cross between a small kazoo, a trombone, and a trumpet. At the lower, left-hand corner of the postcard is the following: "Sworn statement by Warner Record Co., January 21, 1925". I want one of these postcards to add to my collection!!!