Water-tight fitting of a glass in a watch case

摘要

A watch case includes a middle-bezel having a non-circular upper opening receiving a glass of corresponding non-circular shape. The glass has an outwardly-directed peripheral flange able to pass with a slight play through the upper opening in the middle-bezel, and the middle-bezel has an inwardly-directed collar defining its upper opening. A packing seal is disposed with a part under the collar and a part resting on the flange. A screw-fitted circular back applies pressure to the glass to compress the seal between the collar and flange and thereby hold the glass in the upper opening.