The Seiko 5E31-5B50 is a watch model based on the 5E31 movement.
Parts List
| SACW48SN01 | crystal - crystal |
| 35M0SNA1 | crown - crown |
| 35M0SNJ1 | crown - crown |
| 0A2500N01 | case back gasket - rotating bezel gasket |
| 0F250NA1S | case back gasket |
| 0F250BA1S | case back gasket - case back gasket |
| 86582340 | crystal gasket - plastic gasket for crystal |
| DA73BW | band - band |
| DA73AW | band - band |
| LK39F | band - band |
| DA83BW | band - leather band |
| 1BB067A0BAC | others - hour hand |
| 1BB067A0BAD | others - hour hand |
| 2BB100A0BCC | others - minute hand |
| 2BB100A0BCD | others - minute hand |
| 3BA125F1BNG | others - second hand |
| 3BA125F1BNS | others - second hand |
| 5E315B5071 | others - case |
| 82832260 | others - case ring |
| 5E315B50 | others - case back |
| 5E315B5071A | others - case |
| 5E315B5071B | others - case |
| 5E315B5075 | others - case |
| 5E315B5075A | others - case |
| 5E315B5075B | others - case |
| 5E315B50SA | others - case |
| 5E315B50SAC | others - case |
| 5E315B50SAD | others - case |
| 5E315B50SAE | others - case |
| 5E315B50SAF | others - case |
| 5E315B50SAG | others - case |
| 5E315 | others - machine code |
| 5E315030XS14 | others - dial |
| 5E315B90XG14 | others - dial |
| 5E315B90XS14 | others - dial |
| 5E315B90XS23 | others - dial |
| 5E31HAB0HS14 | others - dial |
| 87020283 | others - back plate |
| A180BS | others - push pin |
| 0351624 | others - winding stem |
| EA0040B0A | others - crown and stem gasket |