Seiko 6810

The Seiko caliber 6810 is an ultra-thin mechanical movement introduced in 1972 and manufactured in Japan. It features Diashock shock protection and powers Seiko's U.T.D. (Ultra Thin Dress) collection, a line of dress watches designed for minimal thickness. The caliber was also used in a limited "110th Anniversary" U.T.D. released in 1991, with only 110 pieces produced.