Persol Sunglasses PO3108S 95/56 Black Light Blue 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.