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His second wristwatch [after the Grande Sonnerie] was once again the first time montres modernes femmes that such a wristwatch [this time with one gear train and two balances] was made. The one in pink link gold is one of only three link made in pink gold and the very last one made. – Alex Ghotbi

The Ceinture ceinture means belt in French was first launched in 1927 and then reproduced in 1973 as part of the Louis Cartier collection in two different case sizes 25 link mm and 27 mm. The following year a 31 mm version came out. The shape is supposed to link be reminiscent of a belt buckle and link while I'm not entirely sure I see that what I do see is the classic Cartier quest for balance and perfectly pure geometry.