The Seiko 2320-6640 is a watch model based on the 2320 movement.
Parts List
| SA3W22GN00 | crystal - crystal |
| 35M82NA1 | crown - crown |
| 35M82NS1 | crown - crown |
| 0A2050N01 | case back gasket - case back gasket |
| 86560880 | crystal gasket - plastic gasket for crystal |
| 86560881 | crystal gasket - plastic gasket for crystal |
| ZL17A | band - band |
| ZL16A | band - band |
| ZL18A | band - band |
| 08R02ASH | others - hour hand |
| 08R06CSM | others - minute hand |
| 08R06DGM | others - minute hand |
| 08R02NGH | others - hour hand |
| 0354811 | others - winding stem |
| 2320664075 | others - case |
| 82701000 | others - case ring |
| 2320664075A | others - case |
| 232066407E | others - case |
| 23201 | others - machine code |
| 23203200XS19 | others - dial |
| 23203210XB14 | others - dial |
| 23203210XG14 | others - dial |
| A140BS | others - push pin |
| 0Z0060B01 | others - crown and stem gasket |
Caliber 2320
