An 18ct gold diamond-set 'Instrumento Novantatre' automatic wristwatch, by De Grisogono

An 18ct gold diamond-set 'Instrumento Novantatre' automatic wristwatch, by De Grisogono The diamond-set rectangular engine-turned dial with Arabic '3' and '9', date and month apertures and subsidiary seconds to pavé diamond shoulders and polished bronze 18ct gold bezel, to an 18ct darkened gold double deployant clasp, <i>European Convention marks, case 40mm wide, with papers, in maker's presentation box</i> Dial, case and buckle signed De Grisogono, case signed Instrumento Novantatre, case no. 022090