Vintage Yellow & Red Enamel Caterpillar Pin

Wonderful vintage enamel pin by A.H. Dondero Inc. of Washington, D.C., featuring an unusually charming caterpillar motif.  The rectangular brass-tone pin features a colorful apple-green caterpillar set diagonally against a vibrant yellow field with deep ruby-red enamel corners.   The red sections display beautiful engine-turned guilloché-style texture beneath the enamel, creating exceptional depth and shimmer in the light.  The caterpillar itself is wonderfully detailed, with individually articulated-looking segments and tiny circular accents. An unusual example of vintage American insignia.  Reverse is stamped A.H. DONDERO INC. / WASH. D.C. and retains its original-style screw-back fastening.  * Vintage A.H. Dondero Inc. * Washington, D.C. maker * Estimated circa 1930s–1950s * Brass-tone metal * Colorful enamel work * Engine-turned / guilloché detailing * Caterpillar / insect motif * Screw-back construction * Beautifully preserved color * Natural age-related patina and some oxidation/verdigris visible on reverse * Exact original organization or significance of the caterpillar motif is unknown  A wonderfully unusual piece for collectors of vintage enamel, antique insignia, insect jewelry, guilloché work or quirky historical accessories.