High-quality enamel and metal casting, 44 mm high by 33 mm wide, 20 grams. (Pin is similar to the style reported by Pandis, page 71, Imperial German Flight Badges, Vol II). No hallmarks. Sea bird casting at the top and crown/anchor at the bottom attached to enamel back with four rivets (two top and two bottom). These are difficult to verify as period pieces since many were produced post-WWII although this one has some WWI characteristics. Never the less a high quality piece with highly detailed castings and enamel.