Vintage Carved Fish Brooch hotsell Lucite and Blue Large

Original Vintage Fish Brooch. Looks like Lucite but I think it is cast hotsell resin then carved underneath for depth. The Fins are Blue & have little bubbles in them making me think these are cast. Hand carved detail. Riveted pin back in good shape. Measures 2 1/2" x 2 1/2". Glass eye accent. I have a few other pins currently listed like this one that belonged to my mother-in-law and she has had them since the 1940s. Fabulous Vintage. Q's please convo... thank you and enjoy!