Vintage Bausch Lomb Otoscope

Vintage Bausch Lomb Otoscope. From the estate of Dr. Arnold L. Gibson who lived and practiced medicine in Los Angeles from the 1930's. Dr. Gibson was born on the late 1800's I am not certain if this is working so I will say for collectable or decorative use. Box is leather and engraved with Dr. GIbon's name. Thank you for looking