Seiko 9726-8000 Watch Guide The Seiko 9726-8000 is a watch model based on the 9726 movement.Parts List290W37HN00crystal40ME1NA1crownDJ2890B01case back gasket0Z2780B0Acase back gasketCaliber 9726Other models with the same movement9726-50009726-50099726-8009