The Seiko 5S21-0A31 is a watch model based on the 5S21 movement.
Parts List
310W74JN01 | crystal - crystal |
45M86NA1 | crown - crown |
0A3100N01 | case back gasket |
AC05A | band - band |
13T06DBM | others - minute hand |
13SC20TB | others - second hand |
13T06DBH | others - hour hand |
82811000 | others - case ring |
0351684 | others - winding stem |
5S210A31 | others - case back |
5S210A3176 | others - case |
5S210A41XS19 | others - dial |
5S218 | others - machine code |
81350820 | others - spring |
81871361 | others - case bow |
87020380 | others - back plate |
0Z0060B01 | others - crown and stem gasket |
Caliber 5S21
![Caliber manual page](https://www.theseikoguy.com/media/movements/5/5S21A_caliber_en_1.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/5/5S21A_caliber_en_2.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/5/5S21A_caliber_en_3.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/5/5S21A_caliber_en_4.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/5/5S21A_caliber_en_5.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/5/5S21A_caliber_en_6.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/5/5S21A_caliber_en_7.jpg)