The Seiko 4N21-039B is a watch model based on the 4N21 movement.
Parts List
| 175A02SN02 | crystal - crystal |
| 30M81DA5 | crown - crown |
| 30M81NA4 | crown - crown |
| 0F150BAA5 | case back gasket - case back gasket |
| 0H1600B01 | case back gasket - case back gasket |
| 0F150BA1S | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| WN68BW | band - band |
| DA46BW | band - band |
| WU96BW | band - leather band |
| U96BW | band - leather band |
| WR89BW | band - band |
| DA46BW-BJ00 | clasp - buckle |
| 3BA075F1BNG | others - second hand |
| 3BA090F1BNG | others - second hand |
| 1BB047A1BNG | others - hour hand |
| 2BB070A1BNG | others - minute hand |
| 0351155 | others - winding stem |
| 82841030 | others - case ring |
| 4N21039B75A | others - case |
| 82352776 | others - bezel |
| 4N21039B | others - case back |
| 4N21039B75B | others - case |
| 4N21039B75D | others - case |
| 4N21039B75E | others - case |
| 4N21039B75C | others - case |
| 4N212380XG14 | others - dial |
| 4N212600XG14 | others - dial |
| 4N212600XG24 | others - dial |
| 4N2164 | others - machine code |
| A110AS | others - push pin |
| 1BB050A1BNG | others - hour hand |