The Seiko 2N20-0100 is a watch model based on the 2N20 movement.
Parts List
| 175A01SN02 | crystal |
| 25M25DA5 | crown - crown (3h) |
| 6M25Z5NNGA | crown |
| 0G1600B01 | case back gasket - case back gasket |
| MK16E | band - leather band |
| MK17E | band - leather band |
| DZ0040B01 | others - crown and stem gasket |
| 07M53JCH | others - hour hand |
| 0351107 | others - winding stem |
| 2N200100 | others - case back |
| 2N20010043A | others - case |
| 2N20010043B | others - case |
| 2N200210X91Z | others - dial |
| 2N200220XS14 | others - dial |
| 2N2011 | others - machine code |
| 82841890 | others - case ring |
| A110AS | others - push pin |
| 07M53JGM | others - minute hand |
| 07M55JBM | others - minute hand |
| 07M55JEH | others - hour hand |
Caliber 2N20
Other models with the same movement
| 2N20-0010 |
| 2N20-0020 |
| 2N20-0040 |
| 2N20-0050 |
| 2N20-0060 |
| 2N20-0070 |
| 2N20-0080 |
| 2N20-0090 |
| 2N20-0110 |
| 2N20-0130 |
| 2N20-0140 |
| 2N20-5000 |
| 2N20-5010 |
| 2N20-5020 |
| 2N20-5030 |
| 2N20-5050 |
| 2N20-5060 |
| 2N20-5070 |
| 2N20-5080 |
| 2N20-5090 |
| 2N20-509A |