The Seiko 2P20-5840 is a watch model based on the 2P20 movement.
Parts List
| SA4W79HN01 | crystal |
| 32M55NK1 | crown |
| 32M55NS1 | crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0F175BAA5 | case back gasket - case back gasket |
| 86582650 | crystal gasket - plastic gasket for crystal |
| 86582655 | crystal gasket - plastic gasket for crystal |
| B5431H | band - metal band |
| B5431H-LKS | band - link |
| B5431L | band - metal band |
| B5431L-LKG | band - link |
| B5431L-PB1 | clasp - parts for buckle/clasp |
| B5431L-BK4G | clasp - clasp |
| B5431H-PB1 | clasp - parts for buckle/clasp |
| B5431H-BK4S | clasp - clasp |
| 07Y33DGH | hand - hour hand |
| 07Y33DGM | hand - minute hand |
| 2P201560XN14 | others - dial |
| 2P201560XS14 | others - dial |
| 2P205840 | others - case back |
| 2P20584061 | others - case |
| 2P205840WZ | others - case |
| 82811990 | others - case ring |
| A110AS | others - push pin |
Caliber 2P20
