The Seiko B137-4050 is a watch model based on the B137 movement.
Parts List
| SA3N48GM01 | crystal - crystal (inorganic) |
| 35M76NS1 | crown |
| 0A0064B01 | case back gasket |
| 80612069 | pusher |
| HL03A | band - leather band |
| 0357769 | others - winding stem |
| A130BS | others - push pin |
| B1371 | others - machine code |
| B13740502EA | others - case |
| 0A0084B01 | others - crown and stem gasket |
Other models with the same movement
| B137-4000 |
| B137-4010 |
| B137-4030 |
| B137-403A |
| B137-4060 |