The Seiko 6R21-00C0 is a watch model based on the 6R21 movement.
Parts List
| 260P03SN03 | crystal - crystal (sapphire) |
| 350P29S20A | crystal - crystal (sapphire) |
| 0D008BA11 | crown - crown and stem gasket |
| 9K80A5SNS0 | crown - crown (3h) |
| 0F260BAD2 | case back gasket - case back gasket |
| 86585421 | crystal gasket - plastic gasket for crystal |
| 86582040 | crystal gasket - plastic gasket for crystal |
| 86585420 | crystal gasket - plastic gasket for crystal |
| 86585520 | bezel gasket - plastic gasket for bezel |
| 4A1V1AK | band - leather band |
| 4A1V1AKBDB | band - leather without buckle |
| 4A1W1AX | band - metal band |
| 4A1W1AXLK | band - link |
| B1LW51SA00W | clasp - clasp |
| H14W12SA00B | clasp - clasp |
| 1FG092L0BES | hand - hour hand |
| 2FG140L4BES | hand - minute hand |
| 3BA037A0BNS | hand - small hand(3h) |
| 3BA045A4BNS | hand - small hand (9h) |
| 3EA145A0BDS | hand - second hand |
| 3BA040F2BNS | others - sub hand |
| 0E340BA1S | others - rotating bezel gasket |
| 81181459 | others - bracelet fixing pipe |
| 81601039 | others - bracelet fixing pin |
| 0351200 | others - winding stem |
| 81607379 | others - bracelet fixing pin |
| S240CS | others - push pin |
| 4A1W1AXEP | others - endpiece |
| 6R2100B0XB13 | others - dial |
| 6R2100B0XS13 | others - dial |
| 6R2100C0 | others - case back |
| 6R2100C001A | others - case |
| 6R2100C002A | others - case |
| 6R2100C0XB13 | others - dial |
| 6R2100C0XS13 | others - dial |
| 6R2120E | others - machine code |
| 81507539 | others - case back screw 2 |
| 82319935 | others - bezel |
| 82319939 | others - bezel |
| 82847939 | others - case ring |
| 84331195 | others - dial ring |
| 84331196 | others - dial ring |
| 89927479 | others - casing clamp |
Caliber 6R21
Other models with the same movement
| 6R21-00A0 |
| 6R21-00B0 |
| 6R21-00D0 |
| 6R21-00E0 |
| 6R21-00F0 |
| 6R21-00R0 |
| 6R21-01A0 |
| 6R21-01B0 |
| 6R21-01F0 |
| 6R21-01H0 |
| 6R21-01J0 |