The Seiko 4N21-0190 is a watch model based on the 4N21 movement.
Parts List
| 240A02SN02 | crystal - crystal (sapphire) |
| 35MZ1NA1 | crown - crown |
| 0F220BAA3 | case back gasket - case back gasket |
| 0H2200B01 | case back gasket - rotating bezel gasket |
| AK14D | band - band |
| 3AA125F1ANG | others - second hand |
| 10T99JGH | others - hour hand |
| 10T99JGM | others - minute hand |
| 0351157 | others - winding stem |
| 4N21019075 | others - case |
| 82351231 | others - bezel |
| 82843390 | others - case ring |
| 4N210190 | others - case back |
| 4N210460XG14 | others - dial |
| 4N2164 | others - machine code |
| A140BS | others - push pin |
| DZ0040B01 | others - crown and stem gasket |
| 10SC23T1 | others - second hand |