The Seiko 4N20-0870 is a watch model based on the 4N20 movement.
Parts List
| 230A02SN01 | crystal - crystal |
| 150P09HN03 | crystal - crystal(case back) |
| 6M35C1KDG0 | crown - crown |
| 0F190BAA1 | case back gasket - case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| 86587210 | crystal gasket - plastic gasket for crystal |
| GB41B | band - band |
| 8552505A | band - other |
| 09Y21JCH | others - hour hand |
| 2CD095ABBHG | others - minute hand |
| 81304019 | others - button spring |
| 81190075 | others - bracelet fixing pipe |
| 81180249 | others - bracelet fixing pipe |
| 81607059 | others - bracelet fixing pin |
| 4N2008709KA | others - case |
| 82825550 | others - case ring |
| 81614635 | others - bracelet fixing pin |
| 4N200870 | others - case back |
| 4N201430XG14 | others - dial |
| 4N2061 | others - machine code |
| DZ0040B01 | others - crown and stem gasket |