Here is a super-simple Sterling silver double 'mobius' bangle from the design studio of the famous Danish silversmithy Georg Jensen. I have been unable to identify the designer, but the pattern number indicates that this bangle was created in the mid 1970s.
Condition: Excellent, no visible damage
Marks G with superimposed decorated J logo (as used in the early 20th century and now used on pieces too narrow to take the lozenge logo, as well as as their website icon), 925S, Denmark, A32B
Size: 6.5 cm ( 2.6") internal diameter