The Seiko 5S21-6000 is a watch model based on the 5S21 movement.
Parts List
| 275W41SN01 | crystal |
| 37M05NA1 | crown |
| 37M05NS1 | crown |
| 0F220BAA3 | case back gasket - case back gasket |
| GK60B | band - leather band |
| GK61B | band - leather band |
| GK62B | band - leather band |
| 2BC110A1BAH | others - minute hand |
| 82832950 | others - case ring |
| 5S21600075 | others - case |
| 5S2160007E | others - case |
| 5S216000XG14 | others - dial |
| 5S216010XS19 | others - dial |
| 5S216020XS19 | others - dial |
| 5S219 | others - machine code |
| A180BS | others - push pin |
| 0D005BA13 | others - crown and stem gasket |
| 0351683 | others - winding stem |
| 11SC73TL | others - second hand |
| 11T05AMH | others - hour hand |
| 11T05AMM | others - minute hand |
| 11T71AMH | others - hour hand |
| 11T71AMM | others - minute hand |
| 11T81AMH | others - hour hand |
| 11T81AMM | others - minute hand |
| 1BA080A1BAL | others - hour hand |
| 1BC080A1BAH | others - hour hand |
| 2BA115A1BAL | others - minute hand |
Caliber 5S21
