Crown: Screwdown Crown
spring bar diameter: 1
Watch mirror: sapphire crystal with AR coating
Luminous: Swiss BGW9 super luminous
and is resistant to aging and weather
Stretching Fly Adjustable Clasp For 18mm/20mm/22mm Steeldive Crown: Screwdown CrownSuitable For Endlink width 18mm 20mm 22mm Material: 316L Solid Stainless Steel Size: 18mm 20mm 22mm Clasp: New Fly Adjustable Clasp,No Logo. 18mm fit for model: SD1906, SD1928, SD1933, SD1934, SD1934T K, SD1952, SD1952T, SD1952V, SD1953, SD1954, SD1954C, SD1962, SD1964(V2), SD1965, SD1967, SD1968, SD1970, SD1970C, SD1970J, SD1971, SD1972(V2), SD1973(V2),SD1974, SD1974T, SD1977, SD1981, SD1984, SD1986, SD1992(V2 clasp), SD1993, SD1994, SF740, 20mm fit