Hi Pedro,
Geo did an excellent history presentation of the Tank a few weeks ago. Called "CARTIERS's TANK; born from war, built for peace"
Here's the link:
[
revo-online.com]
It was sort of Cartier's versio of the JLC Reverso. If you scroll down from the beginning of the article quite a way, you will find it with photos.
Cheers,
Carl