The Seiko 4N20-0189 is a watch model based on the 4N20 movement.
Parts List
| 185A02SN02 | crystal |
| 185A02SN | crystal |
| 185W65SN01 | crystal |
| 185W65SN | crystal |
| 25M55DA1 | crown |
| 0F160BAA5 | case back gasket - case back gasket |
| 0F160BAA | case back gasket |
| Z5388C | band |
| Z5388C-LKG | band - link |
| Z5388G-LKG | band - link |
| Z5388G | band |
| Z5388C-BK4S | clasp - clasp |
| Z5388G-BK4G | clasp - clasp |
| DZ0040B01 | others - crown and stem gasket |
| 0351156 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81181459 | others - bracelet fixing pipe |
| 81604779 | others - bracelet fixing pin |
| 82832635 | others - case ring |
| 4N200189 | others - case back |
| 4N2001896Y | others - case |
| 4N20018975 | others - case |
| 4N200350XS14 | others - dial |
| 4N200360XS14 | others - dial |
| 4N2061 | others - machine code |
| 07Y65JGM | others - minute hand |
| 07Y59JGM | others - minute hand |
| 07Y65JGH | others - hour hand |
| 07Y59VJH | others - hour hand |