David Oscarson Winter Collection Cufflinks In Sterling Silver with Onyx Black Hard Enamel. The Winter Collection continues in the spirit of artistic mastery and the tradition of Old World craftsmanship by combining the centuries-old technique of Guilloché with the art and expertise of Hard Enamel. The Winter Collection is also the first to incorporate three levels of Guilloché on each Collection piece. Amazing Cuff Links for an Amazing Man. Classic and Tailored.