Persol Sunglasses 3108 960/S3 Striped Brown Blue Polarized 49mm takes its inspiration from that ultimate retro throwback, the typewriter. Rivets represent keys, Typewriter edition is stamped in the interior with classic American Typewriter font, and an impression of the lines of the type bars are subtly carved on the temple tips interiors. The style is completely retro with the round shape and classic metal bridge for a truly unique look.