The Seiko V231-521A is a watch model based on the V231 movement.
Parts List
| SA5W43LV02 | crystal - crystal (inorganic) |
| 35ME5NN1 | crown - crown |
| 0F164BA11 | case back gasket - case back gasket |
| 86574870 | crystal gasket - plastic gasket for crystal |
| 510MU | band - band |
| 1AF027AABNG | others - hour hand |
| 2AF040AABNG | others - minute hand |
| 3BA075F1BNG | others - second hand |
| 04P03NGH | others - hour hand |
| 04P03NGM | others - minute hand |
| 05SC01NG | others - second hand |
| A120BS | others - push pin (for lb) |
| 0354235 | others - winding stem |
| 0D005BA11 | others - (crowndichtung) |