The Seiko 4N21-0110 is a watch model based on the 4N21 movement.
Parts List
| 195W69SN01 | crystal |
| 35E57NS1 | crown |
| AC004BAA1 | case back gasket - crown and stem gasket |
| 0F180BAA3 | case back gasket |
| 86592450 | crystal gasket - plastic gasket for crystal |
| DL16B | band - leather band |
| DL17B | band - leather band |
| 09SC31EB | others - second hand |
| 3BA125F1BAB | others - second hand |
| 0351156 | others - winding stem |
| 08T85DNH | others - hour hand |
| 82832715 | others - case ring |
| 4N210110 | others - case back |
| 4N21011061 | others - case |
| 4N210180XS19 | others - dial |
| 4N210190XN1Z | others - dial |
| 4N2164 | others - machine code |
| A130BS | others - push pin |
| 08T85DNM | others - minute hand |