Seiko 7770-5200 Watch Guide The Seiko 7770-5200 is a watch model based on the 7770 movement.Parts List0D220BA11case back gasketGI112others - other bandOther models with the same movement7770-50007770-50107770-50117770-50307770-50317770-503A7770-503B7770-50407770-50417770-50507770-50517770-50707770-50717770-50807770-50817770-50907770-50917770-51407770-51417770-51607770-51707770-51807770-51907770-52107770-52207770-52397770-52407770-52507770-52517770-52607770-52707770-52807770-52907770-60007770-60017770-60107770-60207770-60307770-60407770-60507770-60607770-60707770-60807770-60907770-60917770-61007770-70007770-8000