The Seiko 3Y03-0A40 is a watch model based on the 3Y03 movement.
Parts List
| 200W26LN01 | crystal - crystal |
| 200W26LN | crystal |
| 30MB6NA1 | crown |
| 0A1900N01 | case back gasket - case back gasket |
| EZ0035B0 | case back gasket |
| 86580100 | crystal gasket - plastic gasket for crystal |
| 86179140 | bezel gasket - plastic gasket for bezel |
| BJJ56G | band |
| BJJ56K | band |
| 08SC14NG | others - second hand |
| A130AS | others - push pin (for lb) |
| 0866553 | others - holding ring for dial |
| 0878505 | others - date dial |
| 3Y030A40 | others - case back |
| 3Y030A4098 | others - case |
| 3Y030A50XS14 | others - dial |
| 3Y030A58XS14 | others - dial |
| 3Y037 | others - machine code |
| 82344641 | others - bezel |
| 82801600 | others - case ring |
| 0351546 | others - winding stem |
| EZ0035B01 | others - crown and stem gasket |
| 07TB8FBH | others - hour hand |
| 08TA0A1M | others - minute hand |