The Seiko 2K00-0031 is a watch model based on the 2K00 movement.
Parts List
| 285N19JN01 | crystal - crystal |
| 285N19JN | crystal |
| 35MS7NS1 | crown |
| 35MS7NS1 = NL | crown - crown |
| Ersatz = 35MS1NN1 | crown |
| 35MS7NN1 | crown |
| 0H2650B01 | case back gasket |
| 0H2650B0 | case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| WPJ92K | band - leather band |
| ZPA71K | band - leather band |
| ZPA77K | band - leather band |
| ZPJ84K | band - leather band |
| ZPJ98K | band - leather band |
| ZPJ99K | band - leather band |
| ZPZ39J | band |
| ZPJ82K | band |
| ZPJ81J | band |
| ZPA78K | band |
| ZPJ83K | band |
| 82833870 | others - case ring |
| 2K000031 | others - case back |
| 2K00003125 | others - case |
| 2K0000312E | others - case |
| 2K000031XS19 | others - dial |
| 2K000031XS29 | others - dial |
| 2K000041XG14 | others - dial |
| 2K000041XS14 | others - dial |
| 2K000051XB19 | others - dial |
| 2K000051XG19 | others - dial |
| 2K000051XS19 | others - dial |
| 2K000091XS19 | others - dial |
| 2K000091XS29 | others - dial |
| 2K000101XG14 | others - dial |
| 2K000101XS14 | others - dial |
| 2K000111XB19 | others - dial |
| 2K000111XS19 | others - dial |
| 2K0010 | others - machine code |
| A180BS | others - push pin |
| 0351291 | others - winding stem |
| 12Y03ANM | others - minute hand |
| 12Y03ASM | others - minute hand |
| 12Y15DGM | others - minute hand |
| 12Y15CGM | others - minute hand |
| 12Y17DGM | others - minute hand |
| 12Y15CGH | others - hour hand |
| 12Y03AGM | others - minute hand |
| 12Y11AGM | others - minute hand |
| 12Y11NGM | others - minute hand |
| 11Y05ANH | others - hour hand |
| 11Y05ASH | others - hour hand |
| 12Y15DGH | others - hour hand |
| 12Y17DGH | others - hour hand |
| 11Y05AGH | others - hour hand |
| 12Y11NGH | others - hour hand |
| 12Y11AGH | others - hour hand |
| 12Y13AGH | others - hour hand |
Caliber 2K00





Other models with the same movement
| 2K00-0010 |
| 2K00-0020 |
| 2K00-0030 |
| 2K00-0039 |
| 2K00-5000 |
| 2K00-500A |
| 2K00-5010 |