The Seiko 5Y23-5040 is a watch model based on the 5Y23 movement.
Parts List
| ESAW32HM | crystal |
| ESAW32HM01 | crystal |
| 35M82NA1 | crown - crown |
| 0A2700N01 | case back gasket - case back gasket |
| 0A2700N | case back gasket - dichtung -boden |
| 86581040 | crystal gasket - plastic gasket for crystal |
| B1553C | band - metal band |
| B1553C-LKG | band - link |
| B1553C-PB1 | clasp - parts for buckle/clasp |
| B1553C-BK1S | clasp - clasp |
| A180BS | others - push pin |
| 0801719 | others - date dial |
| 5Y23503LXN14 | others - dial |
| 5Y235040 | others - case back |
| 5Y23504061 | others - case |
| 5Y239 | others - machine code |
| 82803560 | others - case ring |
| 0351670 | others - winding stem |
| 13SC04A2 | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
| 10C36LGM | others - minute hand |
| 10C32LGH | others - hour hand |