The Seiko 7N01-637A is a watch model based on the 7N01 movement.
Parts List
| 270P01SN03 | crystal |
| 35E05NA1 | crown - crown |
| 0F250BAA5 | case back gasket - case back gasket |
| 86581930 | crystal gasket - plastic gasket for crystal |
| AD006BAA1 | pusher - button gasket |
| AK23E | band - band |
| 3BA125F1BNG | others - second hand |
| 1AA080A1BNG | others - hour hand |
| 2AA115A1BNG | others - minute hand |
| 82823760 | others - case ring |
| 7N01637A7HA | others - case |
| 7N01637A7HB | others - case |
| 7N010 | others - machine code |
| 7N016470XG14 | others - dial |
| A180BS | others - push pin |