The Seiko 7N42-0BY0 is a watch model based on the 7N42 movement.
Parts List
| 290A37JN02 | crystal - crystal (inorganic) |
| 8M40C7SNS0 | crown - crown |
| 8M40C7SNG3 | crown - crown |
| 0F270BA1S | case back gasket - case back gasket |
| 32W4JZ | band - band |
| 32W4KZ-LK | band - link |
| 32W4LZ-LK | band - link |
| 32W4LZ | band - band |
| 32W4KZ | band - band |
| 32W4LZ-BK | clasp - buckle |
| 32W4LZ-PB | clasp - parts for buckle |
| 32W4KZ-BK | clasp - buckle |
| 32W4KZ-PB | clasp - parts for buckle |
| 1AA080AZBNS | others - hour hand |
| 1AA080AZBNG | others - hour hand |
| 2AA120AZBNG | others - minute hand |
| 2AA120AZBNS | others - minute hand |
| 3BA125F1BNG | others - second hand |
| 3BA125F1BNS | others - second hand |
| 1AE080L0BDG | others - hour hand |
| 1AE080L0BDS | others - hour hand |
| 2AE120L0BDG | others - minute hand |
| 2AE120L0BDS | others - minute hand |
| 0351892 | others - winding stem |
| 81180249 | others - bracelet fixing pipe |
| 81606539 | others - bracelet fixing pin |
| AC006BAD1 | others - crown and stem gasket |
| 7N420DN8XB13 | others - dial |
| 7N420DN8XG14 | others - dial |
| 7N420DN8XN13 | others - dial |
| 7N420DP8XB13 | others - dial |
| 7N420DP8XB24 | others - dial |
| 7N420DP8XL13 | others - dial |
| 7N420DP8XS13 | others - dial |
| 7N420DP8XS24 | others - dial |
| 7N423 | others - machine code |
| 82737920 | others - case ring |
| 7N420BY001D | others - case |
| 7N420BY0 | others - case back |
| 7N420BY002D | others - case |
| 7N420BY003D | others - case |
| 0878580 | others - date dial |
| 0878587 | others - date dial |
| 0878589 | others - date dial |