The Seiko H557-503A is a watch model based on the H557 movement.
Parts List
| ES2W74GN00 | crystal - crystal |
| 40M76NA1 | crown |
| 40M76NS1 | crown |
| 8656 1880 | crystal gasket |
| 8061 3209 | pusher |
| DB0060B01 | others - crown and stem gasket |
| EG0060B01 | others - button gasket |