The Seiko 4N20-0520 is a watch model based on the 4N20 movement.
Parts List
| 195W73SN01 | crystal - crystal |
| 30M09NA5 | crown |
| AC004BA11 | case back gasket - crown and stem gasket |
| 0F155BAA1 | case back gasket - case back gasket |
| 86582830 | crystal gasket - plastic gasket for crystal |
| DB10B | band - band |
| 07Y23JCH | others - hour hand |
| 07Y23JGM | others - minute hand |
| 81606439 | others - bracelet fixing pin |
| 81181459 | others - bracelet fixing pipe |
| 81611159 | others - bracelet fixing pin |
| 4N200520SAA | others - case |
| 82832635 | others - case ring |
| 4N200520 | others - case back |
| 4N200930XS19 | others - dial |
| 4N2061 | others - machine code |
| 89942935 | others - back plate |
| 0351155 | others - winding stem |