Incredible antique cufflinks that tested 9k gold on the tops. The faces resemble a large button and are repoussed. The hammered pattern is intricate and very beautiful. It reminds me of fern coils. They are known as "cuff buttons". The fasteners are typical of the early 1800s and have an unusual pivotable back that snaps back for insertion into the buttonhole of a shirt cuff. They are marked Nov.15, 1851 and have a few other numbers included that I am not familiar with. In wonderful condition with some slight wear to the backs that is consistent with their age. A cuff link connoisseur would love these for their collection. Fabulous gift for a best man, groom or father of the bride. measure 3/4" in diameter x 1/2".