New vintage silver waves ring

New vintage silver waves ring Quick list Measurements to follow Minimalist modern rustic design. Two bands hammered together and form 3 diamonds or waves in the centre. Looks like an argyle pattern. Creative but simple craftsmanship to make something classic! New vintage c. 1970s. Probably handmade in Mexico. I believe it is real silver. Hallmark: I can’t quite make out: 7525??? Note: this was black so I polished it with toothpaste Group photos show the variety in the collection