I commute via bicycle to work each day in central London. The roads has so many holes in them it's like being off road so I'm reluctant to wear my heuers as I'm concerned that I'm damaging the movements any favours. I have some cal 12 /15 watch and one manual carrera. I'm assuming the carrera with the Valjoux movement has no shock protection? I found this on onthedash

"KIF Shock Protection (rather than Incabloc). The Caliber 12 movement used the Incabloc shock protection system, whereas the Caliber 15 movement used the KIF system. The primary difference between the Incabloc and KIF shock protection systems is in the shape of the spring which holds the cap jewel in place; both springs are hinged so that the jewel can be removed without removing the spring."

How much protection are offered by these systems?