This is a massive,spiral frosted clear lucite bangle bracelet. This bangle is featured on page 121 of Plastic Bangles by Lyn Tortoriello and Deborah Lyons. It measures a whopping 1 5/8" wide with 3/4" thick walls. It measures approximately 2 5/8" across the opening and 8" around the inside.
The mark on the inside is a sprue which is from manufacturing. It is not a flaw. Although the sticker is no longer present, this bracelet was made in Western Germany.