The Seiko 1F20-5A10 is a watch model based on the 1F20 movement.
Parts List
| RECN20JK01 | crystal |
| RECN20JK | crystal |
| 30M98NA1 | crown |
| 30M98NH1 | crown |
| 30M98NS1 | crown - crown |
| 0H1400N01 | case back gasket - case back gasket |
| 0H1400N0 | case back gasket |
| DZ0041B0 | case back gasket |
| B5511C | band - metal band |
| B5511C-LKG | band - link |
| B5511G | band - metal band |
| B5511G-LKG | band - link |
| BPA81E | band - leather band |
| BPJ92S | band - leather band |
| B5511G-BK4G | clasp - clasp |
| B5511C-BK4G | clasp - clasp |
| 0351807 | others - winding stem |
| 81180229 | others - bracelet fixing pipe |
| 82812160 | others - case ring |
| 81604399 | others - bracelet fixing pin |
| 1F200A40XG14 | others - dial |
| 1F200A40XN14 | others - dial |
| 1F200A40XS14 | others - dial |
| 1F205A10 | others - case back |
| 1F205A1025 | others - case |
| 1F205A102E | others - case |
| 1F205A102N | others - case |
| 1F205A10HE | others - case |
| 1F209 | others - machine code |
| DZ0041B01 | others - crown and stem gasket |
| 03Y02NGM | others - minute hand |
| 03Y02NGH | others - hour hand |
Caliber 1F20
