The Seiko 8123-6400 is a watch model based on the 8123 movement.
Parts List
| 280W34GN00 | crystal - crystal |
| 40M78NS1 | crown - crown |
| FH2882B0A | case back gasket - case back gasket |
| 86567581 | crystal gasket - plastic gasket for crystal |
| 86178600 | bezel gasket - plastic gasket for bezel |
| YA20A | band - band |
| 11C54KSH | others - hour hand |
| 11C54KSM | others - minute hand |
| 0354765 | others - winding stem |
| 82333129 | others - bezel |
| 82706380 | others - case ring |
| 8123640061 | others - case |
| 81236400 | others - case back |
| 0801622 | others - date dial |
| 0884976 | others - holding ring for dial |
| 81236560XS19 | others - dial |
| 81239 | others - machine code |
| 84320303 | others - dial ring |
| A180CS | others - push pin |
| 13SC06LS | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
Caliber 8123
