Seiko 1421-5590 Watch Guide The Seiko 1421-5590 is a watch model based on the 1421 movement.Caliber 1421Other models with the same movement1421-00101421-00201421-01101421-01191421-01201421-01291421-01301421-01391421-50201421-50211421-50901421-51701421-55301421-55701421-55791421-55801421-55891421-56001421-56091421-56101421-56191421-57701421-57791421-57801421-57901421-58001421-58091421-58601421-5880
