The Fleurier 100 watch movement is a manual wind movement that was used primarily during the period approximately around 1950. It features a unique Incastar regulator, which is the only large-scale produced regulator that incorporates a free oscillating hairspring. The spring is fixed between two rollers, allowing for adjustment of its length and preventing any isochronism error due to the gap between the regulator pins. Further details regarding differences between the 465 and 469 variants are not currently known. The Fleurier 100 movement also includes a sweep second function.