The Seiko 4N21-1200 is a watch model based on the 4N21 movement.
Parts List
| 185A11S20A | crystal - crystal |
| 6M30Z3SNWD | crown - crown |
| 0F170BAD2 | case back gasket - case back gasket |
| D1F4AZ | band - band |
| D1F5AZ | band - band |
| 3BA090F1BNS | others - second hand |
| 1BA050A7BNB | others - hour hand |
| 1BA050A7BNS | others - hour hand |
| 2BA077A5BNS | others - minute hand |
| 2BA077A5BNB | others - minute hand |
| 3BA090F1BAB | others - second hand |
| DZ0040B01 | others - crown and stem gasket |
| 0351550 | others - winding stem |
| 0351155 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81190075 | others - bracelet fixing pipe |
| 82832715 | others - case ring |
| 4N21120061A | others - case |
| 4N211200 | others - case back |
| 4N21120061B | others - case |
| 4N21120098A | others - case |
| 4N212820XL19 | others - dial |
| 4N212820XS19 | others - dial |
| 4N212830XS13 | others - dial |
| 4N2165 | others - machine code |
| 89942935 | others - back plate |