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The Encyclopedia of Horology

Wristwatch · Two-time zone wristwatch

De Grisogono Instrumento Uno Ref. UNO DF S10

Partially verified

This De Grisogono Instrumento Uno, reference UNO DF S10, is a limited edition two-time zone wristwatch, numbered 207/500. The watch is constructed in 18k white gold and features extensive diamond decoration, including 478 diamonds totaling 8.11 carats on the case and an additional 147 white and black diamonds on the dial. The black lacquered dial displays 18k white gold Arabic numerals and functions for a second time zone and date. The timepiece is powered by an ETA 2892A2 caliber movement with a black finish and 21 jewels. It is presented on a leather strap fitted with an 18k white gold double deployant clasp, which is also set with 38 diamonds totaling 1.59 carats. The auction description reports that the crown is set with a black diamond.

Front view of the De Grisogono Instrumento Uno featuring a diamond-set case and black lacquered dial.
Front view of the De Grisogono Instrumento Uno featuring a diamond-set case and black lacquered dial. — Antiquorum. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
catalog.antiquorum.swiss
Category
Wristwatch · Two-time zone wristwatch
Maker / attribution
De Grisogono
Reference
UNO DF S10
Catalogue / lot identifier
300
Source-reported date
circa 2010
Source-reported place
Switzerland
Source-reported serial
000507

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Case and Dial Construction

The watch features a rectangular case crafted from 18k white gold, measuring 33 x 57 mm including the lugs. The exterior is extensively adorned with diamonds, incorporating 478 stones amounting to 8.11 carats. The crown is decorated with a black diamond.

The dial is finished in black lacquer and incorporates 18k white gold Arabic numerals. The indexes are further embellished with 135 white diamonds totaling 0.41 carats and 12 black diamonds totaling 0.04 carats. The dial design includes a sub-dial for a second time zone and a date display.

Evidence for this section
  • “Case setting with 478 diamonds, 8.11 carats”
  • “black lacquered dial, 18K polished white gold arabic numerals”
  • “set with 135 white diamonds, 0.41 and 12 black diamonds, 0.04 on the indexes”

Movement and Mechanical Details

The timepiece is driven by the ETA 2892A2 caliber, a self-winding movement featuring 21 jewels. The movement is finished in black.

The watch functions as a water-resistant, two-time zone instrument with an integrated date display.

Evidence for this section
  • “Caliber ETA 2892A2, black finish, 21 jewels”
  • “Movement: 1* As new Overhaul recommended, at buyer's expense”

Provenance and Identification

This watch is identified as a member of a limited edition of 500 pieces, specifically numbered 207/500. The case back or internal records indicate the serial number 000507.

The watch is accompanied by a branded leather strap and an 18k white gold double deployant clasp, which continues the diamond-set theme of the watch with an additional 38 diamonds totaling 1.59 carats.

Evidence for this section
  • “Limited Edition 207/500”
  • “Case No. 000507”
  • “Property of a Swiss Gentleman”
  • “double deployant clasp in 18K white gold set with 38 diamonds, 1.59 carats”

Open research questions

  • What is the specific nature of the 'black finish' applied to the ETA 2892A2 movement?
  • How does the second time zone mechanism interact with the main time display on this specific reference?

Source evidence

Recorded claims and source quotations for De Grisogono Instrumento Uno Ref. UNO DF S10
FieldSource-reported valueSource quotation
MakerDe Grisogono“DE GRISOGONO, SWITZERLAND”
ReferenceUNO DF S10“REF. UNO DF S10”
Limited Edition207/500“Limited Edition 207/500”
Case Number000507“Case No. 000507”
Case Material18k white gold“18k white gold”
MovementETA 2892A2“Caliber ETA 2892A2”
Diamond Setting478 diamonds, 8.11 carats on case“Case setting with 478 diamonds, 8.11 carats”
Clasp18k white gold set with 38 diamonds“double deployant clasp in 18K white gold set with 38 diamonds, 1.59 carats”

Visible details

  • Case and buckle are heavily set with white diamonds
  • Dial features distinct second time zone sub-dial
  • Crown is set with a single black diamond
  • Strap appears to be a textured black leather or stingray finish

Research qualifications

  • The auction description notes that an overhaul is recommended for the movement at the buyer's expense
  • The actual long-term durability of the factory diamond setting on the case and clasp is not assessed

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

DE GRISOGONO, SWITZERLAND, REF. UNO DF S10, INSTRUMENTO UNO, 18K WHITE GOLD

Reviewed 2026-10-26 · Record 0715b0b046

Terms in this record

Glossary explanations for terms named in this object’s record.

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