The Seiko 6S99-0A20 is a watch model based on the 6S99 movement.
Parts List
| 320A08SB0C | crystal - crystal (sapphire) |
| 270P02SB0A | crystal - crystal (sapphire) |
| 320A08SB0B | crystal |
| 9M60B7ZNW0 | crown - crown |
| 0F300BAD2 | case back gasket - case back gasket |
| DB0055B01 | case back gasket - crown and stem gasket |
| 80711335 | pusher - button |
| AB80AW | band - band |
| 4AA140AACEL | others - second hand |
| 1FC090AACEL | others - hour hand |
| 2FC130AACEL | others - minute hand |
| 3BC042A0CEL | others - small hand (9h) |
| 3BC075A0CEL | others - small hand(3h) |
| 4AC042A0CEL | others - small hand (6h) |
| 0351430 | others - winding stem |
| 89924439 | others - casing spring |
| 82840741 | others - case ring |
| 83200273 | others - button spring clip |
| AD006BA11 | others - crown and stem gasket |
| 86592536 | others - crystal plastic gasket |
| 81354210 | others - button spring |
| 6S990A2001 | others - case |
| S180BS | others - push pin |
| 270P02SB02 | others - (crystal(case back)) |
Other models with the same movement