Abstract: The invention relates to a method of assembling gold alloy parts that enables identical or different gold alloys, particularly gold alloys of different colors, to be assembled. This method comprises the following steps: a) a film of tin is applied over at least one portion of a face of a first gold alloy part; b) the tinned face of the first gold alloy part is brought directly into contact with a face of a second gold alloy part; c) the first and second parts are pressed against each other; and d) the assembly is heated. This method may be used to manufacture checkerboards.

Abstract: This timepiece comprises an annual or perpetual date display mechanism and also comprises means (11) for operating a device (13) for displaying the number of days in the month being displayed.