This flat black rubber ellipse has two holes along the major axis. The major axis is drawn in pencil. A mark on the curve reads: KEUFFEL & ESSER Co (/) NEW YORK (/) AND (/) CHICAGO.
According to the K&E Catalog, these models were sold in sets of ten, with major axes ranging in size from 1 1/2" to 6". This would be the 6" size.
Reference:
Keuffel & Esser Company, Catalog, 1906, p. 215. In the 1909 catalog, models of this number are listed as made from xylonite instead of hard rubber.
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