The Seiko 4S77-0A50 is a watch model based on the 4S77 movement.
Parts List
| 260P02SN02 | crystal - crystal (sapphire) |
| 310P14SR01 | crystal - crystal (sapphire) |
| 310P14SR04 | crystal |
| 1Z45A4STW1 | crown - crown (4h) |
| 8K45F2STW1 | crown - crown(2h) |
| 9E60A2STWA | crown - crown |
| FE328BAD2 | case back gasket - case back gasket |
| 86583420 | crystal gasket - plastic gasket for crystal |
| 86179271 | bezel gasket - plastic gasket for bezel |
| A072AB | band - band |
| 12ST283D | others - second hand |
| 1FX085S0BYS | others - hour hand |
| 2FX120S0BYS | others - minute hand |
| 3DA052A0BXE | others - hand |
| 3DA052A0BXC | others - hand |
| 3DA040A0BXE | others - small hand (6h) |
| 3DA040A0BXC | others - sub hand |
| 0351890 | others - winding stem |
| 0A0150B01 | others - crown and stem gasket |
| 81190055 | others - bracelet fixing pipe |
| 82841221 | others - case ring |
| 81612669 | others - bracelet fixing pin |
| 4S770A5001 | others - case |
| 82345247 | others - bezel |
| 4S770A50 | others - case back |
| 4S770A5002 | others - case |
| 89923379 | others - casing spring |
| DF007BAA1 | others - crown and stem gasket(2h) |
| AD006BAD1 | others - crown and stem gasket |
| 83200219 | others - button spring clip |
| 0354132 | others - winding stem |
| 86177531 | others - crystal plastic gasket |
| 0A0150B0A | others - crown and stem gasket |
Caliber 4S77
Other models with the same movement
| 4S77-0010 |
| 4S77-0020 |
| 4S77-00A0 |
| 4S77-00B0 |
| 4S77-00C0 |
| 4S77-00D0 |
| 4S77-00E0 |
| 4S77-0A20 |
| 4S77-0A30 |
| 4S77-0A40 |