The Seiko 5P31-5050 is a watch model based on the 5P31 movement.
Parts List
| REEN37JV01 | crystal |
| 35NR5NA1 | crown |
| 0H2650B01 | case back gasket |
| 0H2370B02 | case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| G1236C | band - metal band |
| G1236C-BK5S | clasp - clasp |
| 3BA125F1BNG | others - second hand |
| 09SC27NG | others - second hand |
| 5P315050 | others - case back |
| 5P31505029 | others - case |
| 5P315050XB14 | others - dial |
| 82800490 | others - case ring |
| 83111960 | others - case ring |
| A180BS | others - push pin |
| 08T01DGM | others - minute hand |
| 08T01DGH | others - hour hand |