The Seiko 4N00-0391 is a watch model based on the 4N00 movement.
Parts List
| 170N25JM01 | crystal |
| 35MX7NN1 | crown - crown |
| 0H1600B01 | case back gasket - case back gasket |
| 0H1600B0 | case back gasket |
| Z5465L | band |
| Z5465L-BK4S | clasp - clasp |
| Z5465L-PB1 | clasp - parts for buckle/clasp |
| 0351155 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
| 81603329 | others - bracelet fixing pin |
| 81180249 | others - bracelet fixing pipe |
| 82840910 | others - case ring |
| 4N000391 | others - case back |
| 4N00039129 | others - case |
| 4N001521XS29 | others - dial |
| 4N0061 | others - machine code |
| 07Y25NGM | others - minute hand |
| 07Y25NGH | others - hour hand |