The Seiko 6R21-00E0 is a watch model based on the 6R21 movement.
Parts List
| 260P02SN02 | crystal - crystal (sapphire) |
| 350P29S30A | crystal - crystal (sapphire) |
| 0D008BA11 | crown - crown and stem gasket |
| 9K80A7SJS0 | crown - crown (3h) |
| FE363BAD1 | case back gasket - case back gasket |
| 86579880 | crystal gasket - plastic gasket for crystal |
| 86585520 | bezel gasket - plastic gasket for bezel |
| M004151J9 | band - metal band |
| M0041JLK | band - link |
| H1PS12SA02B | clasp - clasp |
| 1FG092L0BES | hand - hour hand |
| 2FG140L4BES | hand - minute hand |
| 3AA150FBAAR | hand - second hand |
| 3AA150FBANS | hand - second hand |
| 3BA025FABNS | others - sub hand |
| 3BA035FMBNS | others - sub hand |
| 3BA042F4BNS | others - small hand(12h) |
| 86177531 | others - crystal plastic gasket |
| 81181459 | others - bracelet fixing pipe |
| 81603619 | others - bracelet fixing pin |
| 0351200 | others - winding stem |
| 89927079 | others - casing spring |
| 6R2100E0 | others - case back |
| 6R2100E001A | others - case |
| 6R2100E0XB13 | others - dial |
| 6R2100E0XS13 | others - dial |
| 6R2120E | others - machine code |
| 82450159 | others - bezel |
| 82848159 | others - case ring |
| S210CS | others - push pin |
| Z160TS | others - push pin (clasp and band) |
Caliber 6R21
Other models with the same movement
| 6R21-00A0 |
| 6R21-00B0 |
| 6R21-00C0 |
| 6R21-00D0 |
| 6R21-00F0 |
| 6R21-00R0 |
| 6R21-01A0 |
| 6R21-01B0 |
| 6R21-01F0 |
| 6R21-01H0 |
| 6R21-01J0 |