The Seiko 5Y23-8A59 is a watch model based on the 5Y23 movement.
Parts List
| 290P09LN03 | crystal |
| 290W61LN01 | crystal |
| 290P09LN | crystal |
| 290W61LN | crystal |
| 40E23NS1 | crown - crown |
| DE010BAA | case back gasket |
| FH2981B0A | case back gasket |
| 86573930 | crystal gasket - plastic gasket for crystal |
| 86566910 | bezel gasket |
| B1623S | band |
| 2AB120LBBBC | others - minute hand |
| 1AB080LBBBC | others - hour hand |
| 3AA125F3A6S | others - second hand |
| DE010BAA1 | others - crown and stem gasket |
| 12SC23T2 | others - second hand |
| 0801722 | others - date dial |
| 5Y238A50 | others - case back |
| 5Y238A5961 | others - case |
| 5Y238C3LXS13 | others - dial |
| 82331539 | others - bezel |
| 82732990 | others - case ring |
| A180CS | others - push pin |
| 0351105 | others - winding stem |
| 12P43MSM | others - minute hand |
| 12P43MSH | others - hour hand |