Copper & Enamel Pendant for Necklace Artisan Signed OOAK

Large round pendant for necklace. I believe it dates from the 1960's. Abstract design in navy blue , white, red and other colors on copper disc. No chain. Measures 2" in diameter. Signed on back by artist, but I can't make out the signature. No dings, dents or noticeable wear, just the slightest bit on edge at back, and that may just be the way it was manufactured, not wear. We re-use shipping materials to reduce waste.