~A DIAMOND AND BLACK DIAMOND "INSTRUMENTO NUMERO UNO" WRISTWATCH, BY DE GRISOGONO

~A DIAMOND AND BLACK DIAMOND "INSTRUMENTO NUMERO UNO" WRISTWATCH, BY DE GRISOGONO
With dual time automatic movement, the rectangular-shaped pavé-set diamond dial with Arabic numerals and subsidiary dual time dial, within a circular-cut black diamond bezel and case, to the beige galuchat strap and circular-cut black diamond and diamond clasp, mounted in 18k black gold and metal, 7 ins., with Swiss assay mark
Signed de Grisogono, Geneve, nos. 063/075 and 000138