Unisex Costa Del Mar 'Osprey' style 6310 Performance Sunglasses in Tortoise colorway. Handmade in the USA. Suitable for men or women. Previously owned, but in excellent condition. No scratches, no hazing, no bite marks on frame. See pics. Notes - Vintage Costa Del Mar Osprey Model Breakdown & Features - Small-Frame Performance: The Osprey model was historically engineered specifically for smaller or narrower faces. - Model ID: The 6310 designation is the specific vintage production code tied to this classic injection-molded acetate frame style. Based on the exact 63-10 sizing sequence printed on your handmade acetate frame, here are the precise factory dimensions for this vintage layout: Frame Measurement Blueprint - Lens Width: 63 mm (the horizontal span of a single lens) Bridge Width: 10 mm (the narrow distance between the two lenses above the nose) Lens Height: ~39 mm to 41 mm (the vertical shape profile typical of Costa's low-profile wrap designs) Temple Arm Length: 125 mm to 130 mm (the length of the arm extending to the ear) Total Outer Frame Width: ~134 mm to 136 mm (measured temple-to-temple across the front) The Ormond Beach Connection: During the late 1980s and throughout the 1990s, Costa Del Mar operated its primary assembly, lens-cutting, and finishing workshop in Ormond Beach, Florida. Frames marked "Handmade USA" were manually buffed, polished, and detailed right here in the United States.