Plastic or electroformed watch case with removable crystal

A watch case comprising a case middle made of plastic or electroformed material and a removable crystal, wherein said crystal, or respectively said case middle, comprises a plurality of elbowed catches, each frontally insertable in a corresponding recess comprised in correspondence in said case middle or respectively in said crystal, in a first relative angular position between said case middle and said crystal called the first position of insertion or of removal, and each said catch being arranged to occupy, in said first angular position of insertion or of removal, a first pressed-in position when the distance between said case middle and said crystal is minimal, said case middle and said crystal being arranged to pivot in relation to each other, in said pressed-in first position of said catches, to a second angular holding position wherein a part of each catch is frontally locked behind a holding surface forming a safety catch comprised in said case middle or respectively in said crystal, and further wherein said case includes a rotation stop means angularly securing said case middle and said crystal in said second angular holding position, and wherein said rotation stop means is frontally snap-fitted on said case middle and/or said crystal by snap-fit fingers comprised in said rotation stop means and which are arranged to cooperate with at least one complementary stop surface, or with complementary snap-fit fingers, comprised in said case middle and/or said crystal.