This is a fantastic transparent blue bangle in a pleasing swirl pattern that catches the light. These date from the 1960s and sometimes appear with a label reading "Made in Western Germany." They are mold-made in Lucite or another modern plastic, and show traces of the mold, including a round indentation and a seam running around the inside. A horizontal seam also runs across the outside but is not very visible. The condition is excellent.
The dimensions are 1 5/8 inch wide, about 5/8 inch thick, with an opening of about 2 3/4 inches across.
I have listed a matching bangle in pale blue, shown in the last photo, as item 1396. There is another of this type in opaque purple listed as item 1260.