Deals Vintage 1960's Bird of peace necklace

I have owned this since the 1970's.
It is unique, and rare .
It is the Dove of peace , and has a spiritual feel to it.
It is made of pewter, and the colored areas is unknown.
The deals chain has a alligator clip attached .
The numbers on the back seem to be the year that it was made.
The maker is unknown.
One of a kind .