The Seiko Y100-5859 is a watch model based on the Y100 movement.
Parts List
| RE4N84GM01 | crystal |
| RE4N84GM02 | crystal |
| 35M98NF1 | crown |
| 0G0055B | case back gasket |
| 0A2600B01 | case back gasket |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0A2600B | case back gasket |
| 242MC | band - metal band |
| 242MC-BK5G | clasp - clasp |
| 82716460 | others - case ring |
| A200BS | others - push pin |
| Y1004230XA15 | others - dial |
| Y10058592S | others - case |
| 0354765 | others - winding stem |
| 07C50DGM | others - minute hand |
| 07C50DGH | others - hour hand |