The Seiko 5Y91-6040 is a watch model based on the 5Y91 movement.
Parts List
| 260W42JM01 | crystal |
| 260W42JM | crystal |
| 35MA8NS1 | crown |
| 35MA8NA1 | crown |
| 0A2300B01 | case back gasket |
| B1728S | band - metal band |
| G1433S | band - metal band |
| G1433G | band |
| B1728G | band |
| B1727G | band |
| G1433G-BK5G | clasp - clasp |
| B1727G-BK5G | clasp - clasp |
| B1728G-BK5G | clasp - clasp |
| 0354786 | others - winding stem |
| 5Y916040 | others - case back |
| 5Y91604075 | others - case |
| 5Y91604079 | others - case |
| 5Y916060XB14 | others - dial |
| 5Y916060XG14 | others - dial |
| 5Y916070XG14 | others - dial |
| 5Y916140XG14 | others - dial |
| 5Y916150X914 | others - dial |
| 5Y916150X924 | others - dial |
| 5Y916150XG14 | others - dial |
| 5Y916160XG14 | others - dial |
| 5Y916160XN14 | others - dial |
| 5Y919 | others - machine code |
| 82820880 | others - case ring |
| A140BS | others - push pin |
| 13SC04A2 | others - second hand |
| 10T76DAH | others - hour hand |
| 10T86DAM | others - minute hand |
| 09TC0DGM | others - minute hand |
| 0Z0060B01 | others - crown and stem gasket |
| 09T32DAM | others - minute hand |
| 09TC0DGH | others - hour hand |
| 09T38DAM | others - minute hand |
| 09T40DAH | others - hour hand |
| 09T32DAH | others - hour hand |
Caliber 5Y91
