The Seiko 8420-6400 is a watch model based on the 8420 movement.
Parts List
RE2N40SN00 | crystal |
25M08NA4 | crown |
0G2435N01 | case back gasket |
GB19A | band - metal band |
DZ0040B01 | others - crown and stem gasket |
81180229 | others - bracelet fixing pipe |
81604259 | others - bracelet fixing pin |
DZ0041B01 | others - crown and stem gasket |
Caliber 8420
![Caliber manual page](https://www.theseikoguy.com/media/movements/8/8420A_caliber_en_1.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/8/8420A_caliber_en_2.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/8/8420A_caliber_en_3.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/8/8420A_caliber_en_4.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/8/8420A_caliber_en_5.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/8/8420A_caliber_en_6.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/8/8420A_caliber_en_7.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/8/8420A_caliber_en_8.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/8/8420A_caliber_en_9.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/8/8420B_caliber_en_1.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/8/8420B_caliber_en_2.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/8/8420B_caliber_en_3.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/8/8420B_caliber_en_4.jpg)