The Seiko 5Y23-5A20 is a watch model based on the 5Y23 movement.
Parts List
| ESEW21LN | crystal |
| ESEW21LN01 | crystal |
| 35M81NN1 | crown |
| 35ML1NN1 | crown - crown |
| 35M81NA1 | crown |
| 35M97NS1 | crown |
| 0F240BAA3 | case back gasket - case back gasket |
| 0F240BAA | case back gasket |
| 86591010 | crystal gasket - plastic gasket for crystal |
| G1352G | band - metal band |
| G1352G-LKG | band - link |
| G1352G-PB1 | clasp - parts for buckle/clasp |
| G1352G-BK1G | clasp - clasp |
| 10T15DGH | hand - hour hand |
| 10T15DGM | hand - minute hand |
| 3AA125F1ANG | others - second hand |
| 0351670 | others - winding stem |
| EB0055B01 | others - crown and stem gasket |
| 5Y235A20 | others - case back |
| 5Y235A2075 | others - case |
| 5Y235A40XG14 | others - dial |
| 82830550 | others - case ring |
| 0801801 | others - date dial |
| A160BS | others - push pin |
| EB0055B0 | others - crown gasket |
| 10SC23T1 | others - second hand |