The Seiko 7N42-7B50 is a watch model based on the 7N42 movement.
Parts List
| 290A03JN02 | crystal - crystal |
| 8M45A2SBW1 | crown - crown |
| 0F280NA1S | case back gasket - case back gasket |
| 4680JM | band - band |
| 4680JM-LK4 | band - link |
| 4680JM-BKD | clasp - buckle |
| 4680JM-PB1 | clasp - parts for buckle |
| 1AF080F0BSW | others - hour hand |
| 2AF115F0BSW | others - minute hand |
| 3AX130F7ANS | others - second hand |
| 1AE075L0BDS | others - hour hand |
| 3AX135F0ANS | others - second hand |
| 2AE115L0BDS | others - minute hand |
| 1AF080F0BSB | others - hour hand |
| 2AF115F0BSB | others - minute hand |
| 7N427B50 | others - case back |
| 7N423 | others - machine code |
| 7N427C78XB13 | others - dial |
| 7N427C78XL13 | others - dial |
| 7N427C78XS13 | others - dial |
| 7N427C88XB19 | others - dial |
| 7N427C88XG19 | others - dial |
| 7N427C88XS19 | others - dial |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 82832120 | others - case ring |
| 0351892 | others - winding stem |
| 7N427B5061Z | others - case |
| 0878580 | others - date dial |
| 0878587 | others - date dial |
| 0878588 | others - date dial |
| 0Z0060B01 | others - crown and stem gasket |