The Seiko 7N42-7B90 is a watch model based on the 7N42 movement.
Parts List
| SA0P42JN03 | crystal - crystal (inorganic) |
| 8K55C6SNW1 | crown - crown (3h) |
| FE298BA11 | case back gasket - case back gasket |
| 86584581 | crystal gasket - plastic gasket for crystal |
| 4J26JB | band - band |
| 3AA120F2AN1 | others - second hand |
| 1BA077F0BE1 | others - hour hand |
| 2BA117F0BE1 | others - minute hand |
| A110BS | others - push pin (for mb) |
| 0878621 | others - date dial |
| 7N423 | others - machine code |
| 7N427D48XB13 | others - dial |
| 84331045 | others - dial ring |
| 82738200 | others - case ring |
| 7N427B9001D | others - case |
| 7N427B90 | others - case back |
| 0351892 | others - winding stem |
| AD006BAD1 | others - crown and stem gasket |
| 3AA117F0AN1 | others - second hand |