The calibre 045MC also has the special feature of a clutch system with a swivel pin. Which in fact means, that the transmission of the movement of the second wheel of the base movement to the chronograph’s central wheel, is effected through a double swivel pin. The advantage of this clutch, is that it suppresses the skip of he hand at the beginning of a translation movement, which is found with the mechanisms of chronographs with a lateral clutch.
This handwound movement is a THA ebauche. THA is a company that was formed by ‘Halter, Journe & Flageollet’, so this calibre is their work. To my knowledge the caliber 045MC was only used for the various Cartier Tortue Mono Poussoir models, the Tank Mono Poussoir and the Debethune Mono Poussoir.