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The term “Cintrée Curvex” (in English “arched in a curve”) refers to the tonneau-shaped housing, which is typical for most of the models of Franck Muller. In contrast to the ordinary housings available on the market this is a more subtle design, because three curved axes of the watch converge at a single spherical point.

Watches of this design are incurvated at 3, 9, 6 and 12 o'clock, while at the classic tonneau shape they are only incurvated at 6 and 9 o'clock.

Correspondingly complex mechanical production methods and tools are needed to produce this form.

Housings of the collection Cintrée Curvex were ​​originally manufactured in seven different sizes, where each of the variants have been offered even in yellow gold, rose gold, red gold, white gold and platinum. Meanwhile, according to the time trend, the Super-Large size has been added.

<table class="html"> <tr> <th bgcolor="#ccffcc">No</th> <th bgcolor="#ccffcc">Type designation</th> <th bgcolor="#ccffcc">Width (mm)</th> <th bgcolor="#ccffcc">Height (mm)</th> </tr> <tr> <th> 2500</th> <td> Mini</td> <td> 20</td> <td> 27</td> </tr> <tr> <th> 2250</th> <td> Lady</td> <td> 22</td> <td> 30</td> </tr> <tr> <th> 1750-1752</th> <td> Small</td> <td> 25</td> <td> 35</td> </tr> <tr> <th> 7500-7502</th> <td> Midsize</td> <td> 28,5</td> <td> 38,5</td> </tr> <tr> <th> 2852</th> <td> Medium</td> <td> 31</td> <td> 43</td> </tr> <tr> <th> 5850</th> <td> Large</td> <td> 32</td> <td> 45</td> </tr> <tr> <th> 6850/7850/7880</th> <td> Magnum</td> <td> 34</td> <td> 45</td> </tr> <tr> <th> 8880-9885</th> <td> Super-Large</td> <td> 39,6</td> <td> 55,4</td> </tr></table>