The Seiko 5Y39-5120 is a watch model based on the 5Y39 movement.
Parts List
| RE2W42JM01 | crystal |
| RE2W42JM | crystal |
| 35M82NA1 | crown - crown |
| 0A2800B01 | case back gasket |
| B1698C-LKG | band - link |
| B1698C | band |
| B1698L-LKG | band - link |
| B1698L | band |
| B1698L-BK4S | clasp - clasp |
| B1698C-BK4S | clasp - clasp |
| 0351670 | others - winding stem |
| 0801738 | others - date dial |
| 5Y395120 | others - case back |
| 5Y39512079 | others - case |
| 5Y39512079Z | others - case |
| 5Y395200XS19 | others - dial |
| 5Y395208XS19 | others - dial |
| 5Y399 | others - machine code |
| 82820860 | others - case ring |
| A190BS | others - push pin |
| 0Z0060B01 | others - crown and stem gasket |
| 08T12AGM | others - minute hand |
| 08T12AGH | others - hour hand |