The Seiko Y100-5509 is a watch model based on the Y100 movement.
Parts List
| ES9N72GM01 | crystal |
| 35M98NF1 | crown |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0A2700B0A | case back gasket |
| 0A2700B01 | case back gasket - gasket |
| 7BS9ZY | band - leather band |
| 82712620 | others - case ring |
| A160BS | others - push pin |
| Y10055092S | others - case |
| Y1005730XB14 | others - dial |
| 0354765 | others - winding stem |
| 09C70DGM | others - minute hand |
| 09C70DGH | others - hour hand |