The Seiko 4N20-5108 is a watch model based on the 4N20 movement.
Parts List
| ET7N21SN01 | crystal |
| ET7N21SN | crystal |
| 25M69NA1 | crown |
| 0G1500B01 | case back gasket - case back gasket |
| 0G1500B0 | case back gasket |
| Z5361G-LKG | band - link |
| Z5361G | band |
| Z5361G-PB1 | clasp - parts for buckle/clasp |
| Z5361G-BK4G | clasp - clasp |
| 2CE042LABDG | others - minute hand |
| 1CE027L2BDG | others - hour hand |
| DZ0040B01 | others - crown and stem gasket |
| 0351155 | others - winding stem |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 81609579 | others - bracelet fixing pin |
| 4N200210XB14 | others - dial |
| 4N200250XS14 | others - dial |
| 4N205108 | others - case back |
| 4N20510825 | others - case |
| 4N2061 | others - machine code |
| 82840395 | others - case ring |
| Z5361G-ES | others - eyelet screw |
| 04Y23JGM | others - minute hand |
| 04Y15DGM | others - minute hand |
| 04Y15DGH | others - hour hand |
| 04Y23JGH | others - hour hand |