The Seiko 5Y91-6090 is a watch model based on the 5Y91 movement.
Parts List
| 275N12JM01 | crystal |
| 35M98NA1 | crown |
| 0G0055B0 | case back gasket |
| 0H2395B01 | case back gasket |
| 0G0055B01 | case back gasket - crown and stem gasket |
| G1461G | band |
| G1461S | band |
| G1461G-BK5G | clasp - clasp |
| 5Y916090 | others - case back |
| 5Y91609025 | others - case |
| 5Y91609029 | others - case |
| 5Y916190XG14 | others - dial |
| 5Y916190XN14 | others - dial |
| 5Y919 | others - machine code |
| 82820880 | others - case ring |
| A140BS | others - push pin |
| 0354786 | others - winding stem |
| 13SC04A2 | others - second hand |
| 10T36DAH | others - hour hand |
| 10T36DAM | others - minute hand |
Caliber 5Y91
