The Vintage 1940s Swank Large Cufflinks feature a black stone or glass (not sure which) with an etched sitting figure design. These cufflinks are marked with an S in a pentagon, dating to around 1945. Picture of mark is not a pic from cufflinks. It is research found. Made in the United States, these cufflinks are a unique and stylish piece that showcases the craftsmanship and quality of vintage jewelry.