The Seiko 5Y91-6100 is a watch model based on the 5Y91 movement.
Parts List
| 275N14JM01 | crystal |
| 275N14JM03 | crystal |
| 35M98NA1 | crown |
| 0G0055B0 | case back gasket |
| 0H2395B01 | case back gasket |
| 0G0055B01 | case back gasket - crown and stem gasket |
| G1462G | band |
| G1462S | band |
| G1462G-BK5G | clasp - clasp |
| 0354786 | others - winding stem |
| 5Y916100 | others - case back |
| 5Y91610025 | others - case |
| 5Y91610029 | others - case |
| 5Y916200XG14 | others - dial |
| 5Y916200XN14 | others - dial |
| 5Y916270XG14 | others - dial |
| 5Y919 | others - machine code |
| 82820880 | others - case ring |
| A140BS | others - push pin |
| 13SC04A2 | others - second hand |
| 09T32DAM | others - minute hand |
| 11TH4NGM | others - minute hand |
| 11TH4NGH | others - hour hand |
| 09T32DAH | others - hour hand |
Caliber 5Y91
