The Pond's insulator was patented on January 23, 1872 by Chester H. Pond.

http://reference.insulators.info/patents/detail/?patent=U-122961

It is a wooden insulator with a metal shield designed to protect the insulator body from weather and abrasion from wire. The bracket was described in the patent letter as having a collar to prevent capillary action of water and the interior parts were coated with non-conductive materials. (From Early and Unusual Telegraph Insulators by Mike Guthrie)

This one appears to have been used indoors as the metal, wood and wooden cross arm are in excellent condition