The Seiko 7N42-0CY0 is a watch model based on the 7N42 movement.
Parts List
| BA0AS4JN02 | crystal - crystal (inorganic) |
| 8K45ATSNW1 | crown - crown (3h) |
| 8K45ATSNG1 | crown - crown (3h) |
| 0F310BAD2 | case back gasket - case back gasket |
| 4KT1JZ | band - band |
| 4KT2KZ | band - band |
| 1AH070L0BDS | others - hour hand |
| 2AH105L2BDS | others - minute hand |
| 3BA125F1BNG | others - second hand |
| 3BA125F1BNS | others - second hand |
| 1AH070L0BDG | others - hour hand |
| 2AH105L2BDG | others - minute hand |
| 0878580 | others - date dial |
| 0878587 | others - date dial |
| 7N420FC8XB13 | others - dial |
| 7N420FC8XS13 | others - dial |
| 7N420FC8XS24 | others - dial |
| 7N423 | others - machine code |
| 84359084 | others - dial ring |
| 84359085 | others - dial ring |
| 84359086 | others - dial ring |
| S190BS | others - push pin |
| AD006BAD1 | others - crown and stem gasket |
| 0351892 | others - winding stem |
| 7N420CY001B | others - case |
| 82770180 | others - case ring |
| 7N420CY0 | others - case back |
| 7N420CY002B | others - case |
| 7N420CY003B | others - case |