The Seiko 5Y23-8B30 is a watch model based on the 5Y23 movement.
Parts List
| 290P02SN02 | crystal - crystal (sapphire) |
| 290W87SN01 | crystal |
| 290P02SN | crystal |
| 290W87SN | crystal |
| 40E23NA1 | crown - crown |
| 40E23NS1 | crown - crown |
| DE010BAA | case back gasket |
| FH2981B0A | case back gasket |
| 86582731 | crystal gasket - plastic gasket for crystal |
| 86566910 | bezel gasket |
| B1623S | band |
| B1623C-LKG | band - link |
| B1623C | band |
| B1623C-PB1 | clasp - parts for buckle/clasp |
| B1623C-BK1S | clasp - clasp |
| 3AA125F3A6S | others - second hand |
| 3AA125F3ANG | others - second hand |
| DE010BAA1 | others - crown and stem gasket |
| 0351105 | others - winding stem |
| 12SC23T2 | others - second hand |
| B1623C-EPG | others - endpiece |
| 0801722 | others - date dial |
| 5Y238B30 | others - case back |
| 5Y238B3061 | others - case |
| 5Y238B3098 | others - case |
| 5Y238E1LXB13 | others - dial |
| 5Y238E1LXN14 | others - dial |
| 5Y238E1LXS13 | others - dial |
| 82333411 | others - bezel |
| 82343411 | others - bezel |
| 82343419 | others - bezel |
| 82732990 | others - case ring |
| A180CS | others - push pin |
| 12SC23T1 | others - second hand |
| 12P43MSM | others - minute hand |
| 12P43MKM | others - minute hand |
| 12P43MGM | others - minute hand |
| 12P43MSH | others - hour hand |
| 12P43MKH | others - hour hand |
| 12P43MGH | others - hour hand |