The Seiko 1221-5720 is a watch model based on the 1221 movement.
Parts List
ESXN27SN00 | crystal - crystal (sapphire) |
30NE1DA5 | crown - crown |
0F150NA11 | case back gasket - case back gasket |
HK68A | band - leather band |
06SS01VG | hand - second hand |
07S45JGH | hand - hour hand |
07S45JGM | hand - minute hand |
07S45VGH | hand - hour hand |
07S45VGM | hand - minute hand |
A130AS | others - push pin (for lb) |
DZ0040B01 | others - crown and stem gasket |
0351117 | others - winding stem |
122110 | others - machine code |
12211020XG14 | others - dial |
12211190XG18 | others - dial |
12215720 | others - case back |
1221572025A | others - case |
1221572025B | others - case |
1221572025C | others - case |
1221572025D | others - case |
1221572025X | others - case |
82721630 | others - case ring |
Caliber 1221
![Caliber manual page](https://www.theseikoguy.com/media/movements/1/1221A_caliber_jp_1.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/1/1221A_caliber_jp_2.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/1/1221A_caliber_jp_3.jpg)
![Caliber manual page](https://www.theseikoguy.com/media/movements/1/1221A_caliber_jp_4.jpg)