Vintage Silver Metal Ring with Ball, size 6.5, Mexican ? Sterling? unmarked

ERA: True vintage item from the 1940s?
MEASUREMENTS: ring size 6.5
MATERIAL: silver tone metal
LABEL: unmarked
Very good silver tone metal ring. It could be sterling but it is unmarked. Has hollow metal ball on the top with open design on the top of the band. Looks like it could have been hand made.

CONDITION: Very good condition. It shows light wear, some tiny dents on the ball. Aging and patina.