The Seiko 7820-5510 is a watch model based on the 7820 movement.
Parts List
| ES2N54GN00 | crystal - crystal (inorganic) |
| 35R08NA1 | crown |
| 35R30NS1 | crown |
| 35R30NA1 | crown |
| 0A2600N01 | case back gasket - case back gasket |
| NK15A | band - leather band |
| 11C14CGH | others - hour hand |
| 11C14CGM | others - minute hand |
| 11C14DGH | others - hour hand |
| 11C14DGM | others - minute hand |
| 0354780 | others - setting/winding stem |
| 0884803 | others - holding ring for dial |
| 7820551025 | others - case |
| 78205700XB12 | others - dial |
| 78205700XG19 | others - dial |
| 78205710XS19 | others - dial |
| 83107230 | others - case ring |
| A170BS | others - push pin |