Rare English designer Marlene McKibbin Lucite or Acrylic bracelet bangle. This bracelet is clear frosted with an open coiled design and has an orange acrylic screening ink application. 
Reference: please check the last two pictures. This special design was pictured in "Classic Plastic - From Bakelite to High-Tech" by Sylvia Katz, Thames and Husdon Editions, copyright 1984. The same bracelet is pictured on page 126. The caption reads: Clear acrylic rod painted with acrylic screening ink. Designed by Marlene McKibbin, England, 1983.