The Seiko 1F20-0B20 is a watch model based on the 1F20 movement.
Parts List
| 135W04JN01 | crystal |
| 135W04JN | crystal |
| 30M98NA1 | crown |
| 0H1300B01 | case back gasket |
| 0H1300B0 | case back gasket |
| Z5367C | band |
| Z5367C-LKG | band - link |
| Z5367G-LKG | band - link |
| Z5367K | band - metal band |
| Z5367K-LKG | band - link |
| Z5367L-LKG | band - link |
| Z5367W | band - metal band |
| Z5367W-LKG | band - link |
| Z5367L | band |
| Z5367G | band |
| Z5367G-BK4G | clasp - clasp |
| Z5367C-BK4S | clasp - clasp |
| Z5367W-BK4G | clasp - clasp |
| Z5367L-PB1 | clasp - parts for buckle/clasp |
| Z5367K-PB1 | clasp - parts for buckle/clasp |
| Z5367L-BK4S | clasp - clasp |
| Z5367K-BK4G | clasp - clasp |
| 0351807 | others - winding stem |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 82813320 | others - case ring |
| 1F200B20 | others - case back |
| 1F200B2025 | others - case |
| 1F200B2025Z | others - case |
| 1F200B202E | others - case |
| 1F200B202EZ | others - case |
| 1F200C60XS19 | others - dial |
| 1F200C68XS19 | others - dial |
| 1F200G20XB14 | others - dial |
| 1F200G20XG14 | others - dial |
| 1F200G28XB14 | others - dial |
| 1F200G28XG14 | others - dial |
| 1F200G30XS19 | others - dial |
| 1F200G38XS19 | others - dial |
| 1F200K78XS14 | others - dial |
| 1F209 | others - machine code |
| 05Y02FGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
| 2CA052A0BNG | others - minute hand |
| 05Y02NGM | others - minute hand |
| 05Y04DAH | others - hour hand |
| 05Y02FGH | others - hour hand |
| 1CA035A0BNG | others - (24 hour hand) |
| 05Y04DAM | others - minute hand |
| 05Y02NGH | others - hour hand |
Caliber 1F20
