Reading of codes of “Luch” watches
| 3 | 9 | 669 | 8 | 843 |
|
| │ | │ | │ | │ | └ | 843 – index number of dial and hands | |
| │ | │ | │ | └ | → | 8 – code of group of material, mode of plating of case band
| |
| │ | │ | └ | ― | → | 669 – index number of the construction of the case
| |
| │ | └ | ― | ― | → | 9 – numeral, designating the length of case-wristlet or the presence of strap: 7 – short strap, 3 – long strap
| |
| └ | ― | ― | ― | → | 3 – code of type of material of plating or garnishing |