A non-magnetic watch component (1) comprising a substrate (4) made of a copper alloy, wherein at least one part of the substrate (4) has a surface layer (5) including Cu.sub.xTi.sub.y intermetallics, and a method for manufacturing this watch component.

A non-magnetic watch component (1) comprising a substrate (4) made of a copper alloy, wherein at least one part of the substrate (4) has a surface layer (5) including CuxTi.sub.y intermetallics, and a method for manufacturing this watch component.

The timepiece assembly includes a first timepiece component (10) assembled with a distinct second timepiece component (20), the first timepiece component (10) having at least one functional part and a receiving opening (11) which can constitute a connecting hole distinct from the functional part, the wall delimiting the receiving opening (11) forming a first connecting surface (12), the second timepiece component (20) having a second connecting surface (22) and being assembled securely with the first timepiece component by direct or indirect contact between the respective first and second connecting surfaces (12, 22) at a securing surface, wherein at least one of the first and second connecting surfaces (12, 22) or a third connecting surface of an optional intermediate third component (30) is made of silicon oxidized by heat treatment so that the first and second timepiece components are secured to one another by the growth of an oxidized silicon layer

A device (100) for setting the position and marking a first (1) and a second (10) timepiece component, which can be assembled together with a single degree of freedom and immobilised by the cooperation of a first screw (4) with a first tapping (12) of the second component (10) via a first notch (2) of the first component (1), and of a second screw (5) with a second tapping (13) of the second component (10) via a second notch (3) of the first component (1), the first (2) and second (3) notches defining a setting range, the second screw (5) being a cone-head screw, arranged to make an imprint on the edge of the second notch (3) under a predetermined tightening torque, in order to permanently mark the relative position of the first component (1) and of the second component (10).