The Seiko 7T42-6A20 is a watch model based on the 7T42 movement.
Parts List
| 280WD6SK01 | crystal |
| 35ML2NH1 | crown |
| 0351580 | crown - winding stem |
| 35ML2NK1 | crown |
| 55M32NH4 | crown |
| 0A2800N01 | case back gasket - case back gasket |
| 86580600 | crystal gasket |
| 80602863 | pusher |
| 80602864 | pusher |
| 81400709 | others - button spring clip |
| 81350540 | others - button spring |
| EG0060B01 | others - button gasket |
| 03E18RR | others - (small hand (9h)) |
| 81180109 | others - bracelet fixing pipe |
| 81601229 | others - bracelet fixing pin |
| 0866603 | others - holding ring for dial |
| 0878547 | others - date dial |
| 0878548 | others - date dial |
| 7T423 | others - machine code |
| 7T426A20 | others - case back |
| 7T426A20WK | others - case |
| 7T426A20ZK | others - case |
| 7T426A30X91Z | others - dial |
| 7T426A30XB1Z | others - dial |
| 03E18TA | others - (small hand (9h)) |
| 04EA6RR | others - (small hand(12h)) |
| 04Y06NAH | others - hour hand |
| 0Z0060B01 | others - crown and stem gasket |
| 13SC04AC | others - second hand |
| 04EA6TG | others - (small hand(12h)) |
| 04EA8CR | others - small hand (6h) |
| 04EA8DG | others - small hand (6h) |
| 04Y06ARH | others - hour hand |
| 12T08NSH | others - hour hand |
| 12T08NSM | others - minute hand |
| 13SC04RA | others - second hand |
Caliber 7T42
Other models with the same movement
| 7T42-6A00 |
| 7T42-6A0A |
| 7T42-6A0B |
| 7T42-6A10 |
| 7T42-6A49 |
| 7T42-6A50 |
| 7T42-6A5A |
| 7T42-6A60 |
| 7T42-6A6A |
| 7T42-7A00 |
| 7T42-7A10 |
| 7T42-7A20 |
| 7T42-7A2A |
| 7T42-7A39 |
| 7T42-7A40 |
| 7T42-7A4A |
| 7T42-7A4B |
| 7T42-7A50 |
| 7T42-7A5A |
| 7T42-7A5B |
| 7T42-F010 |
| 7T42-F01A |