The Seiko 7N21-0040 is a watch model based on the 7N21 movement.
Parts List
| 260A37SN02 | crystal - crystal |
| 8M45A5NNW0 | crown - crown |
| 0F220BA1S | case back gasket - case back gasket |
| D120AQ-LK4 | band - link |
| D120AQ | band - band |
| D120AQ-BKX | clasp - buckle |
| D120AQ-PB2 | clasp - parts for buckle |
| 1AH075A1BAC | others - hour hand |
| 2AH110A1BAC | others - minute hand |
| 3BA125F1BNS | others - second hand |
| 1AH075A1BNS | others - hour hand |
| 2AH110A1BNS | others - minute hand |
| 0351890 | others - winding stem |
| D120AQ-LKPN | others - pin for link |
| 82871850 | others - case ring |
| 7N21004079A | others - case |
| 7N210040 | others - case back |
| 7N21004079B | others - case |
| 7N210 | others - machine code |
| 7N210070XS19 | others - dial |
| 7N210080XB13 | others - dial |
| 7N210100XB13 | others - dial |
| 7N210120XS19 | others - dial |
| A150BS | others - push pin |
| D120AQ-BKPP | others - spring bar for buckle/clasp |
| D120AQ-EP5 | others - endpiece |
| AD006BA12 | others - crown gasket |
Other models with the same movement