The Seiko 4N21-0740 is a watch model based on the 4N21 movement.
Parts List
| 150A02SN02 | crystal - crystal |
| 6M30B9SNW0 | crown - crown |
| 6M30B9NNG2 | crown - crown |
| 6M30B9NNG0 | crown - crown |
| 0F140BA1S | case back gasket - case back gasket |
| D019AZ | band - band |
| D019BZ | band - band |
| D019CZ | band - band |
| D019DZ-LK00 | band - link |
| D019DZ | band - band |
| D019CZ-BK00 | clasp - clasp |
| D019DZ-BK00 | clasp - clasp |
| 1BC042A1BNG | others - hour hand |
| 3BA075F1BNG | others - second hand |
| 3BA075F1BNS | others - second hand |
| 1BC040A1BNG | others - hour hand |
| 2BC060A1BNG | others - minute hand |
| 81606439 | others - bracelet fixing pin |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 82833415 | others - case ring |
| 4N21074075 | others - case |
| 4N210740 | others - case back |
| 0351155 | others - winding stem |
| D019DZ-BKSC | others - safety chain |
| DZ0040B01 | others - crown and stem gasket |
| 4N2107407N | others - case |
| 4N21074075A | others - case |
| 4N2107407EA | others - case |
| 4N211420XS14 | others - dial |
| 4N211430XS19 | others - dial |
| 4N212680XS19 | others - dial |
| 4N212680XS29 | others - dial |
| 4N212690XZ19 | others - dial |
| 4N2164 | others - machine code |
| 2BC057A1BNG | others - minute hand |