The Seiko 5Y91-504A is a watch model based on the 5Y91 movement.
Parts List
| RE2W16JM02 | crystal |
| RE2W16JM | crystal |
| 35MA8NA1 | crown |
| 0A2200B01 | case back gasket - case back gasket |
| G1381G | band |
| G1381G-BK5G | clasp - clasp |
| 0354786 | others - winding stem |
| 5Y91504A | others - case back |
| 5Y91504A75 | others - case |
| 5Y915050XB14 | others - dial |
| 5Y919 | others - machine code |
| 82813680 | others - case ring |
| A180BS | others - push pin |
| 13SC04A2 | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
| 07T34DAM | others - minute hand |
| 07T34DAH | others - hour hand |
Caliber 5Y91
