An unusual and rare 18K gold and gilt key wind calendar striking pair case with painted horn gilt outer case


Date: Circa 1799Movement: Gilt with large aperture for repeater bell, form of dead-beat escapement with twin escape wheels with inter-spaced cranked teeth, repeating on a bellDial: White enamel, black Arabic numerals, black outer minute divisions, oval inner calendar markers, gilt leaf form handsCase: Polished inner with engraving to back, outer gilt with under painted horn pastoral sceneSize: 52mm
|The unusual and very rare crank tooth twin escape wheel escapement looks to be that which Charles Gros (Echappements d-Horloges et de Montres, 1914) credits to Pierre Le Roy in 1742.With kind assistance from David Penney.