The Seiko 5S21-8A00 is a watch model based on the 5S21 movement.
Parts List
| 295W34SN01 | crystal |
| 30M34NA4 | crown |
| 0A2700B01 | case back gasket - gasket |
| 86581560 | case back gasket |
| 2K10A | band - leather band |
| 5S218A0075 | others - case |
| 5S218A00XS19 | others - dial |
| 5S219 | others - machine code |
| 82800340 | others - case ring |
| A180BS | others - push pin |
| 0351683 | others - winding stem |
| 12ST08DG | others - second hand |
| 12T12AGM | others - minute hand |
| 12T12AGH | others - hour hand |
Caliber 5S21
