In 2017, F.P. Journe created a unique split seconds chronograph wristwatch in tantalum with blue dial for the famed charity auction, Only Watch. When announced, it was the first time that the manufacture created a split seconds movement in a wristwatch. The timepiece eventually sold for 1.15 million Swiss Francs, surpassing its initial estimate. At the time, it became one of the most expensive wristwatches from an independent watchmaker ever sold at auction.

Like with many creations for Only Watch, brands use the auction as a canvas to test and innovate technologies to later benefit serially produced models for commercial use. As such, F.P. Journe officially released the Chronographe Monopoussoir Rattrapante in 2018. When F.P. Journe announced the release of his Only Watch creation, he had declared that it was unequivocally a unique piece, meaning the watch and the movement within would not be reproduced. Keeping true to his word, the Chronographe Monopoussoir Rattrapante was a completely new reference joining the LineSport collection, with a modified movement and the addition of a big date display. It was launched in pink gold, platinum and titanium.

Inside the present LineSport split second chronograph beats the exceptional hound-wound caliber 1518, further visible in all its pride through the sapphire case back. An evolution of the movement Journe used in the initial Only Watch unique piece, the caliber 1518 could be viewed as an enhanced iteration of the previous caliber 1517.