| Zenith Watch Index | Internet Wristwatch Index | How to regulate mechanical watches |
| plt = platinum, y = yellow, p = pink, w = white, PR = power reserve, size = Diameter (mm), thickness = height |
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| Case | Bracelet | Dial | Diameter (mm) | Calibre | Model Number |
| steel | brown leather | silver | n/a | EL PRIMERO 400 | 03.0550.400/02.C507 |
| steel | brown rubber | silver | n/a | EL PRIMERO 400 | 03.0550.400/02.R513 |
| steel | steel | silver | n/a | EL PRIMERO 400 | 03.0550.400/02.M550 |
| steel | black leather | black | n/a | EL PRIMERO 400 | 03.0550.400/22.C503 |
| steel | black rubber | black | n/a | EL PRIMERO 400 | 03.0550.400/22.R512 |
| steel | steel | black | n/a | EL PRIMERO 400 | 03.0550.400/22.M550 |
| rose gold | black leather | silver | n/a | EL PRIMERO 400 | 18.0550.400/01.C503 |
| rose gold | black leather | black | n/a | EL PRIMERO 400 | 18.0550.400/21.C503 |
| rose gold | black rubber | black | n/a | EL PRIMERO 400 | 18.0550.400/21.R512 |
| rose gold | black rubber | silver | n/a | EL PRIMERO 400 | 18.0550.400/01.R512 |
| Zenith Watch Index | Internet Wristwatch Index | How to regulate mechanical watches |
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