The Seiko 4N21-0660 is a watch model based on the 4N21 movement.
Parts List
| 160A02SN02 | crystal - crystal (sapphire) |
| 6M30B5NNG1 | crown - crown |
| 6M30B5NNG2 | crown - crown |
| 0F140BAA3 | case back gasket - case back gasket |
| DZ63B | band - metal band |
| DZ64B | band - metal band |
| 1BC045A1BNG | others - hour hand |
| 2BC065A1BNG | others - minute hand |
| 3BA075F1BNG | others - second hand |
| DZ0040B01 | others - crown and stem gasket |
| 0351155 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81181459 | others - bracelet fixing pipe |
| 81607559 | others - bracelet fixing pin |
| 82833415 | others - case ring |
| 4N210660 | others - case back |
| 4N21066075 | others - case |
| 4N2106607N | others - case |
| 4N211280XS14 | others - dial |
| 4N211290XG14 | others - dial |
| 4N2164 | others - machine code |
| 1BF045A1BNG | others - hour hand |
| 2BF065A1BNG | others - minute hand |