The Seiko 6S78-0A20 is a watch model based on the 6S78 movement.
Parts List
| 330P10SZ01 | crystal |
| 330P10SB0A | crystal - crystal (sapphire) |
| 9E60A2TTAA | crown - crown |
| FE328BAD2 | case back gasket - case back gasket |
| 86583540 | crystal gasket - plastic gasket for crystal |
| 86583040 | bezel gasket - plastic gasket for bezel |
| 80609304 | pusher - button |
| A064GB | band - band |
| 4AA045F0BVE | others - sub hand |
| 3DA040A0BXC | others - sub hand |
| 4AA045F0BVC | others - sub hand |
| 1FX090S0BYS | others - hour hand |
| 2FX130S0BYS | others - minute hand |
| 3DA040A0BXE | others - small hand (6h) |
| 4AX135F0BYL | others - second hand |
| 4AX135F0BYM | others - hand |
| 81354210 | others - button spring |
| 83200273 | others - button spring clip |
| AD006BAD1 | others - crown and stem gasket |
| 0A0150B01 | others - crown and stem gasket |
| 81190055 | others - bracelet fixing pipe |
| 0351430 | others - winding stem |
| 89924439 | others - casing spring |
| 82840401 | others - case ring |
| 81612369 | others - bracelet fixing pin |
| 6S780A2001 | others - case |
| 82297404 | others - bezel |
| 6S780A20 | others - case back |
| 6S780A20WF | others - case |
| 0A0150B0A | others - crown and stem gasket |
Other models with the same movement