Horological calotte forming a casing for handling and/or presenting a horological movement

A horological calotte forming a casing for handling and/or presenting a horological movement according to a calibre model belonging to a predetermined family of calibres, said movement comprising a control member projecting radially relative to a movement axis (DM), and the distal part of said control member is distant from said movement axis (DM) by a radial value (VR) specific to said calibre model, said calotte comprising a transport ring specific to said calibre model of said movement, and which is arranged to cooperate by fitting in a single angular position;

• on the one hand with a bottom, and with a cover, for enclosing said movement with the exception of said control member thereof passing radially, in a radial direction (DR), through at least a first recess comprised in said transport ring,
• wherein said calotte has the same outer shape for all calibres of said predetermined family, and comprises outer reference shoulders (240), at least some thereof are symmetrical relative to a calotte axis (DC),
• wherein said transport ring is arranged to position said movement axis (DM) of said movement eccentrically relative to said calotte axis (DC), in said radial direction (DR) defined by said first recess, according to an eccentricity value such that said distal part of said control member is distant from said calotte axis (DC) by a predefined value (VP), said predefined value (VP) being identical for all calibres of said family,
• wherein said bottom and said cover each comprise, perpendicular to said calotte axis (DC), a flat outer plate, having an identical contour when projected over one another, and when said calotte is in the closed position where said bottom and said cover are angularly indexed in position relative to said transport ring and fitted therewith,
• wherein said transport ring comprises an outer lip which, when said calotte is in the closed position in which said bottom and said cover are angularly indexed in position relative to said transport ring and fitted therewith, projects from shoulders comprised in said bottom and said cover respectively,
• wherein said outer lip has an identical contour to that of said flat outer plates of said bottom and of said cover when projected over one another, and when said calotte is in the closed position wherein said bottom and said cover are angularly indexed in position relative to said transport ring and fitted therewith,
• wherein said outer lip and said flat outer plates each comprise a positioning notch, said positioning notches being aligned, parallel to said calotte axis (DC), when said calotte is in the closed position wherein said bottom and said cover are angularly indexed in position relative to said transport ring and fitted therewith, and
• wherein said outer lip and said flat outer plates, each comprise a locating notch to distinguish the dial side from a bridge side of said movement, said locating notches being aligned, parallel to said calotte axis (DC), when said calotte is in said closed position.