The Seiko 7N42-6A20 is a watch model based on the 7N42 movement.
Parts List
| 290P04HN03 | crystal - crystal |
| 290WA6JN01 | crystal |
| 8M35A0NNG1 | crown - crown |
| 1E55C2SNW1 | crown - crown |
| FE308BA13 | case back gasket - case back gasket |
| 0A2800B01 | case back gasket |
| 86583820 | crystal gasket - plastic gasket for crystal |
| ZPK29G | band |
| 49N7JB | band - band |
| ZPB01K | band - leather band |
| ZPB10K | band - leather band |
| ZPK29K | band - leather band |
| ZPK30K | band - leather band |
| ZPK38K | band - leather band |
| ZPB01G | band |
| ZPK30G | band |
| 3AA125F0ANG | others - second hand |
| 1AD080AABAA | others - hour hand |
| 1AC082FABES | others - hour hand |
| 2AD120AMBAA | others - minute hand |
| 2BC120FABES | others - minute hand |
| 1AC082FABEB | others - hour hand |
| 2BC120FABEB | others - minute hand |
| 3AX125F5ANS | others - second hand |
| 3AX125F5ANB | others - second hand |
| 0351892 | others - winding stem |
| 82737920 | others - case ring |
| 82832120 | others - case ring |
| V7426A2061W | others - case |
| V7426A20 | others - case back |
| V7426A2061X | others - case |
| V7426A2061Z | others - case |
| 0878580 | others - date dial |
| 0878587 | others - date dial |
| 0878588 | others - date dial |
| 0878589 | others - date dial |
| 7N423 | others - machine code |
| 7N426A20 | others - case back |
| 7N426A2075 | others - case |
| 7N426A2075Z | others - case |
| 7N426A20XB14 | others - dial |
| 7N426A20XG14 | others - dial |
| 7N426A20XS14 | others - dial |
| 7N426A28XB14 | others - dial |
| 7N426A28XG14 | others - dial |
| 7N426A28XS14 | others - dial |
| 7N426A30XS14 | others - dial |
| 7N426A38XS14 | others - dial |
| 7N426A40XS14 | others - dial |
| 7N426A48XS14 | others - dial |
| 84318564 | others - dial ring |
| 84318566 | others - dial ring |
| 84318567 | others - dial ring |
| A180BS | others - push pin |
| S180BS | others - push pin |
| V7428B38XB13 | others - dial |
| V7428B38XL13 | others - dial |
| V7428B38XS1Z | others - dial |
| 0A0150B0A | others - crown and stem gasket |
| 89995390 | others - pusher spacer |
| 2AB120A4BNG | others - minute hand |
| AD006BA12 | others - crown gasket |
| 1AB085A0BNG | others - hour hand |
| 12T02NGH | others - hour hand |
| 12C16AGM | others - minute hand |