The Seiko 5421-516A is a watch model based on the 5421 movement.
Parts List
| ES4N76GN00 | crystal - crystal |
| 35M94NA1 | crown |
| 0G0055B01 | case back gasket - crown and stem gasket |
| 0A1800N01 | case back gasket |
| MK66A | band - band |
| 07SC02NG | others - second hand |
| 06T18DGM | others - minute hand |
| 06T24DGH | others - hour hand |
| A120BS | others - push pin (for lb) |
| 54210390XS14 | others - dial |
| 54211 | others - machine code |
| 5421516A25 | others - case |
| 0354705 | others - winding stem |
| 82706080 | others - case ring |
Caliber 5421
