The Seiko 1F20-5B70 is a watch model based on the 1F20 movement.
Parts List
| RECN38JK | crystal |
| RECN38JK01 | crystal |
| 30M98NA1 | crown |
| 30M98NS1 | crown - crown |
| 0H1400B01 | case back gasket - case back gasket |
| DZ0041B0 | case back gasket |
| 0H1400B0 | case back gasket |
| B5537C | band - metal band |
| B5537C-LKG | band - link |
| B5537G | band - metal band |
| B5537G-LKG | band - link |
| B5537S | band - metal band |
| B5537S-LKS | band - link |
| B5537S-BK3S | clasp - clasp |
| B5537G-BK3G | clasp - clasp |
| B5537C-BK3S | clasp - clasp |
| 0351807 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81180229 | others - bracelet fixing pipe |
| 82812160 | others - case ring |
| 1F200D30XG14 | others - dial |
| 1F200D30XN14 | others - dial |
| 1F205B70 | others - case back |
| 1F205B7025 | others - case |
| 1F205B702E | others - case |
| 1F205B702N | others - case |
| 1F209 | others - machine code |
| 03Y04NGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
| 03Y10NAH | others - hour hand |
Caliber 1F20
