The Seiko 1E20-551A is a watch model based on the 1E20 movement.
Parts List
| RE9N14JM | crystal |
| RE9N14JM02 | crystal - crystal (inorganic) |
| 30M68NA1 | crown - crown |
| 0H1500N0 | case back gasket |
| 0H1500N01 | case back gasket - case back gasket |
| DZ0041B0 | case back gasket |
| Z5162C | band - metal band |
| Z5162D-LKG | band - link |
| Z5162C-LKG | band - link |
| Z5162D | band - metal band |
| Z5162D-BK4G | clasp - clasp |
| Z5162C-PB1 | clasp - parts for buckle/clasp |
| Z5162D-PB1 | clasp - parts for buckle/clasp |
| Z5162C-BK4S | clasp - clasp |
| 03V08DGH | others - hour hand |
| 0351931 | others - winding stem |
| 1E200830XN14 | others - dial |
| 1E200840XS14 | others - dial |
| 1E20551A25 | others - case |
| 1E208 | others - machine code |
| 82724660 | others - case ring |
| B080AS | others - push pin |
| 0354930 | others - winding stem |
| 03V08DGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
Caliber 1E20
