精工 cal. 7A28 Seiko Chronograph

型號/Model..................................7A28 Chronograph
機芯/Movement Quartz..............7A28 movement
石數/# of jewels...........................15J
生產年份/Production date...........1983
口徑/Width.................................37mm
入手難易度/Rarity.......................★★★☆☆

備註/Remarks
- The World’s first quartz chronograph.
- Most collectiable models:
1. RAF 7a28 - 11000+ pieces were issued to British RAF helicopter pilots
2. Alien 7a28 – designed by Giugiaro, was worn by Sigconey Weaver in the movie "Aliens". The following is the catalog of Giugiaro Seiko models
http://my.reset.jp/~inu/ProductsDataBase/Products/SEIKO/GIUGIARO-collection/GIUGIARO-collection.htm

********My 7a28 is not either one of the above model, just the regular one.