The Seiko 5S21-6020 is a watch model based on the 5S21 movement.
Parts List
| 260W87SR01 | crystal |
| 30ME5NA4 | crown - crown |
| 0F220BAA3 | case back gasket - case back gasket |
| 86592470 | crystal gasket |
| 86592490 | bezel gasket |
| GB62A | band - metal band |
| 0D005BA13 | others - crown and stem gasket |
| 0351683 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81181459 | others - bracelet fixing pipe |
| 81606299 | others - bracelet fixing pin |
| 82840870 | others - case ring |
| 5S216020 | others - case back |
| 5S216020WMA | others - case |
| 5S216040XB14 | others - dial |
| 5S219 | others - machine code |
| 82343536 | others - bezel |
| 11T91VGH | others - hour hand |
| 11SC793G | others - second hand |
| 11T91VGM | others - minute hand |
Caliber 5S21
