The Seiko 5Y23-5120 is a watch model based on the 5Y23 movement.
Parts List
| SABW20JN01 | crystal |
| SABW20JN | crystal |
| 35M82NA1 | crown - crown |
| 0A2700B01 | case back gasket - gasket |
| G1431G | band |
| G1431G-LKG | band - link |
| G1434K | band |
| G1431G-BK4G | clasp - clasp |
| 0878543 | others - date dial |
| 0878544 | others - date dial |
| 5Y235070XB14 | others - dial |
| 5Y235070XG24 | others - dial |
| 5Y235120 | others - case back |
| 5Y23512075 | others - case |
| 5Y238 | others - machine code |
| 82820620 | others - case ring |
| A180BS | others - push pin |
| 0351670 | others - winding stem |
| 13SC04A2 | others - second hand |
| 09T46DAM | others - minute hand |
| 0Z0060B01 | others - crown and stem gasket |
| 10T42DAH | others - hour hand |