The Seiko 4207-503A is a watch model based on the 4207 movement.
Parts List
| RE2W05L50B | crystal |
| RE2W05LM | crystal |
| RE2W05LM02 | crystal |
| 40MC5NS1 | crown - crown |
| FH2030B04 | case back gasket |
| DB0055B0 | case back gasket |
| DB0055B01 | case back gasket - crown and stem gasket |
| 86590330 | crystal gasket |
| B5486S | band |
| 07C03LGM | others - minute hand |
| 07C03LGH | others - hour hand |
| 3BA075F1BNG | others - second hand |
| 07SC17NG | others - second hand |
| 0351420 | others - winding stem |
| 83137810 | others - case ring |
| 0801274 | others - date dial |
| 0884435 | others - holding ring for dial |
| 4207008LXB14 | others - dial |
| 4207503A | others - case back |
| 4207503A61 | others - case |
| 420755 | others - machine code |
| A140BS | others - push pin |