The Seiko 7N42-7B30 is a watch model based on the 7N42 movement.
Parts List
| 290P18SB0C | crystal - crystal |
| 40M98NB1 | crown - crown |
| FH2981B01 | case back gasket - case back gasket |
| 86582980 | crystal gasket - plastic gasket for crystal |
| D0V4DB | band - band |
| D0V4EB | band - band |
| D0V4DB-LK00 | band - link |
| D0V4EB-LK00 | band - link |
| D0V4EB-BK00 | clasp - clasp |
| D0V4DB-BK00 | clasp - clasp |
| 1AB075A1BNG | others - hour hand |
| 2AB120A1BNG | others - minute hand |
| 3AA125F0ANG | others - second hand |
| 0351892 | others - winding stem |
| D0V4DB-BKPP | others - spring bar for buckle/clasp |
| D0V4DB-EP00 | others - endpiece |
| 82830140 | others - case ring |
| 7N427B30WF | others - case |
| 7N427B30 | others - case back |
| 0878580 | others - date dial |
| 7N423 | others - machine code |
| 7N427C30XE14 | others - dial |
| 7N427C40XG14 | others - dial |
| 89920255 | others - back plate |
| A180BS | others - push pin |
| D0V4EB-EP00 | others - endpiece |
| 0Z0060B01 | others - crown and stem gasket |