A crystal/glass or screen of an apparatus intended to display an information visible to a user includes on its outer surface a transparent protective film with a convex outer surface, constituting a lens in order to facilitate reading. The transparent protective film constituting a lens is a layer (2) of transparent sapphire glass material having an anti-scratch surface. This layer (2) includes a convex outer surface forming a lens and an inner surface carrying a transparent repositionable glue film (4) by which said layer (2) can be removably glued to the outer surface of the crystal or of the screen (1).

A watch glass (1) has a near field communication (NFC) module (3) which includes at least one microcircuit (3.2) connected to an antenna (3.1). A watch (2) is equipped with such a glass (1). A method produces such a watch glass (1).

The wristwatch includes a case middle (3) and a load-reacting surface (2a) which is a surface of a load-reacting ring (2) distinct from the case middle (3), and a protective casing including the crystal (1), the case middle (3), and the load-reacting ring (2) housed within the case middle (3) including the load-reacting surface (2a) against which the crystal (1) bears, and a back (4) bearing against the load-reacting ring (2).

Method for forming a transparent timepiece component including top and bottom surfaces: a transparent polymerizable material is chosen; there is applied to a plate a flexible female mold including a capillary network and having a contact surface which is the negative of the bottom surface, bordered by an edge; a cavity is delimited by the sealed juxtaposition of the edge with a plate having a contact surface which is the negative of the top surface; the material is injected through the capillary network to fill the cavity; the material is polymerized to obtain a rigid component; the component is removed from the plates by the deformation of this flexible mold. Hardness is improved by the UV exposition of this component.