The Seiko W620-4520 is a watch model based on the W620 movement.
Parts List
| ES0P89L20A | crystal - crystal (inorganic) |
| ES0P89L20B | crystal - crystal (inorganic) |
| 0F260BAD2 | case back gasket - case back gasket |
| 86641190 | crystal gasket - plastic gasket for crystal |
| A35E11PAN0 | pusher - front button |
| A35E11PAW0 | pusher - front button |
| HE2Z01SMN0 | pusher - button |
| HE2Z01SMS0 | pusher - button |
| 3021JP | band - band |
| 3021MP | band - band |
| 3021JP-LK2 | band - link |
| 3021MP-LK3 | band - link |
| 3021JP-BKJ | clasp - buckle |
| 3021MP-BKL | clasp - buckle |
| 3021JP-PB2 | clasp - parts for buckle |
| 3021MP-PB2 | clasp - parts for buckle |
| 82836970 | others - case ring |
| W620452001D | others - case |
| W6204520 | others - case back |
| W620452002D | others - case |
| 83200273 | others - button spring clip |
| 81351630 | others - button spring |
| AD006BAD1 | others - crown and stem gasket |
| W62030 | others - machine code |
| W62050 | others - machine code |
| 81606439 | others - bracelet fixing pin |
| 81190075 | others - bracelet fixing pipe |