| 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 |
| Class XT |
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| Case | Bracelet | Dial | Diameter (mm) | Calibre | Model Number | |
| steel | black leather | silver | n/a | EL PRIMERO 4002 | 03.0520.4002/01.C492 | |
| steel | black rubber | silver | n/a | EL PRIMERO 4002 | 03.0520.4002/01.R511 | |
| steel | steel | silver | n/a | EL PRIMERO 4002 | 03.0520.4002/01.M520 | |
| steel | black leather | black | n/a | EL PRIMERO 4002 | 03.0520.4002/21.C492 | |
| steel | black rubber | black | n/a | EL PRIMERO 4002 | 03.0520.4002/21.R511 | |
| steel | steel | black | n/a | EL PRIMERO 4002 | 03.0520.4002/21.M520 | |
| rose gold | black leather | silver | n/a | EL PRIMERO 4002 | 18.0520.4002/01.C492 | |
| rose gold | black leather | black | n/a | EL PRIMERO 4002 | 18.0520.4002/21.C492 | |
| white gold | black leather | silver | n/a | EL PRIMERO 4002 | 65.0520.4002/01.C493 | |
| white gold | black leather | black | n/a | EL PRIMERO 4002 | 65.0520.4002/21.C493 | Class T |
| steel | black leather | silver | n/a | EL PRIMERO 4002 | 03.0510.4002/01.C492 | |
| steel | steel | silver | n/a | EL PRIMERO 4002 | 03.0510.4002/01.M510 | |
| steel | black leather | black | n/a | EL PRIMERO 4002 | 03.0510.4002/21.C492 | |
| steel | steel | black | n/a | EL PRIMERO 4002 | 03.0510.4002/21.M510 | |
| Zenith Watch Index | Internet Wristwatch Index | How to regulate mechanical watches |
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