The Seiko 4N01-0640 is a watch model based on the 4N01 movement.
Parts List
| 165A02SN05 | crystal - crystal |
| 6M30Z3SNG0 | crown - crown |
| 6M30Z3SNWB | crown - crown |
| FE183BA11 | case back gasket |
| 4821LB | band - band |
| 4821JB | band - band |
| 4821KB | band - band |
| 4821JB-LK1 | band - link |
| 4821KB-LK2 | band - link |
| 4821LB-LK2 | band - link |
| 4821JB-BKD | clasp - buckle |
| 4821JB-PB2 | clasp - parts for buckle |
| 4821KB-BKI | clasp - buckle |
| 4821KB-PB2 | clasp - parts for buckle |
| 4821LB-BKI | clasp - buckle |
| 4821LB-PB2 | clasp - parts for buckle |
| 3BA075F1BNG | others - second hand |
| 3BA075F1BNS | others - second hand |
| 1BC045A1BNG | others - hour hand |
| 2BB062A1BNG | others - minute hand |
| 2BB062A1BNS | others - minute hand |
| 1BB042A1BNG | others - hour hand |
| 1BB042A1BNS | others - hour hand |
| 0351155 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81190075 | others - bracelet fixing pipe |
| 82851170 | others - case ring |
| 4N01064061A | others - case |
| 4N010640 | others - case back |
| 4N01064075A | others - case |
| 4N010640SFA | others - case |
| 4N011321XG14 | others - dial |
| 4N011321XS13 | others - dial |
| 4N011331XS14 | others - dial |
| 4N0161 | others - machine code |
| DZ0040B01 | others - crown and stem gasket |
| 2BC062A1BNG | others - minute hand |