If this is a zipper pull, then it would most likely be from after 1917. Here is why.
History of the zipper ~
Elias Howe who invented the sewing machine recieved a patent in 1851 for an "automatic continuing closure device". He did not actively market it. Forty-two years later (1893) Witcomb Judson marketed his "clasp locker" which was a hook and eye fastener. With the financial support of Colonel Lewis Walker, Judson launched the Universal Fastener Company to manufacture the new device, which had it's debut at the Chicago World's Fair in 1893. It however was met with little commercial success.
The modern "zipper" was not designed until 1913 by Gideon Sundback. The patent for the "Separable Fastener" was issued in 1917. The popular "zipper" name came from the B.F. Goodrich company that used Sunback's fastener on a new type of rubber boot or (golashes) and from then on the name stuck.
Early uses for the zipper were for closing rubber boots and tobacco pouches.