The Seiko 2P21-5380 is a watch model based on the 2P21 movement.
Parts List
| RE3W01HK01 | crystal |
| 35MR9NS1 | crown - crown |
| 35MR9NN1 | crown |
| 0F220BAA3 | case back gasket - case back gasket |
| AK43C | band - leather band |
| AK44C | band - leather band |
| 3BA075F1BNG | others - second hand |
| 3BA075F1BNS | others - second hand |
| 07SC17NG | others - second hand |
| 07SC17NS | others - second hand |
| 0351236 | others - winding stem |
| 2P211040XG14 | others - dial |
| 2P211040XS13 | others - dial |
| 2P215380RF | others - case |
| 2P215380XZ | others - case |
| 2P219 | others - machine code |
| 82830630 | others - case ring |
| A190BS | others - push pin |
| DZ0040B01 | others - crown and stem gasket |
| 07T59DGH | others - hour hand |
| 07T59DGM | others - minute hand |
| 07T59DSH | others - hour hand |
| 07T59DSM | others - minute hand |
Caliber 2P21
