The Seiko 1221-0100 is a watch model based on the 1221 movement.
Parts List
| 170A01SN01 | crystal - crystal (sapphire) |
| 170N37SN00 | crystal |
| 27N01NA5 | crown |
| 27N01NW5 | crown - crown |
| 0H1450B01 | case back gasket - case back gasket |
| 86222565 | clasp - clasp |
| 07S35DGH | hand - hour hand |
| 07S35DGM | hand - minute hand |
| 12210100 | others - case back |
| 1221010025A | others - case |
| 122101002EA | others - case |
| 122101002EC | others - case |
| 122101002EE | others - case |
| 12210620XG14 | others - dial |
| 12210620XS14 | others - dial |
| 122110 | others - machine code |
| DZ0040B01 | others - crown and stem gasket |
| 82706630 | others - case ring |
| 0351117 | others - winding stem |
| 07SS09VG | others - second hand |
Caliber 1221
