Antique Art Deco GUILLOCHE Enamel Sterling Silver Cufflinks Double-Sided Blue

There is a makers mark stamped on the back but it's so tiny I can't make it out. Pictured is exactly what you will receive. See photos for measurements. Please look at the photos closely as I try to take pictures of any flaws. Please expect normal wear for vintage/preowned items. Some vintage jewelry may have patina, loss of color tone, scratches or any other common vintage jewelry wear.