Vintage 1970's Clear Glass Ruffle Edge Cake Plate or Serving Platter

This vintage platter style round plate from the 1970's features clear glass with concentric circular varying geometric patterns on the bottom, three small angular risers to elevate the plate, ruffled edges, and a smooth top. Diameter: 11.25” Very good used condition (see photos): - small mark at the very centre - no other damage or signs of wear