I need help in identifying this necklace and dating it. It isn't marked on the back but has a metal tag on the chain with an Eagle 5 with an M underneath and on the other side of the tag it has Hechoen Mexico 965. The style is of Matilde Poulat & Ricardo Salas but the eagle 5 would indicate Jorge Chato Castillo. Would it be from 1948 - 1970? Thanks

