Here is a delightful Sterling silver cuff bangle with a small domed amethyst which hides the small hole at the rear into which the closure clip fits. How ingenious is that. Unofrtunately the identity of the maker is not disclosed. 

Condition: Excellent, no visible damage. 

Marks: 925 Sterling Finland

Size:  Internal circumference is 16 cm (6.5")   Very fexible silver, so stretches very wide to allow wrist through (at least 6 cm)

Year: 1970s?