The Seiko 4S15-0020 is a watch model based on the 4S15 movement.
Parts List
| 320A07JN02 | crystal - crystal |
| 9M50A7SNW1 | crown - crown |
| 0F280BA1S | case back gasket - case back gasket |
| DB0055B01 | case back gasket - crown and stem gasket |
| 0H3000B02 | crystal gasket - case back gasket |
| D0J3AG | band - band |
| D0J3FG | band - band |
| 1FE090ZABDG | others - hour hand |
| 1FE090ZABDS | others - hour hand |
| 1FF100ZABDG | others - hour hand |
| 1FF100ZABDS | others - hour hand |
| 2FE140ZABDG | others - minute hand |
| 2FE140ZABDS | others - minute hand |
| 2FF140ZABDG | others - minute hand |
| 2FF140ZABDS | others - minute hand |
| 3AA140FAANG | others - second hand |
| 3AA140FAANS | others - second hand |
| 0354132 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81190075 | others - bracelet fixing pipe |
| 4S15002061A | others - case |
| 82872650 | others - case ring |
| 4S150020 | others - case back |
| 4S15002061B | others - case |
| 0884373 | others - holding ring for dial |
| 4S150020XL13 | others - dial |
| 4S150030XS14 | others - dial |
| 4S150040XG14 | others - dial |
| 4S1510 | others - machine code |
Caliber 4S15
Other models with the same movement
| 4S15-00A0 |
| 4S15-6000 |
| 4S15-6010 |
| 4S15-7000 |
| 4S15-7010 |
| 4S15-7020 |
| 4S15-7030 |
| 4S15-7040 |
| 4S15-8000 |
| 4S15-8030 |
| 4S15-8050 |