Skip to content
The Encyclopedia of Horology

Wristwatch · Diver's wristwatch

Bulgari Diagono Professional Reference SD 42 S

Partially verified

This Bulgari Diagono Professional, reference SD 42 S, is a self-winding diver's wristwatch dated circa 2010. The timepiece is constructed from stainless steel and features a tonneau-shaped case measuring 42 mm in diameter. It is equipped with a 60-minute graduated unidirectional revolving bezel intended for tracking decompression times and a winding crown protected by guards. The black dial includes centre-seconds and an aperture displaying the date at the 3 o'clock position. The watch is marked as a chronometer and rated for water resistance to 2000 meters (6570 feet). It is fitted with an integrated black rubber strap and a stainless steel deployant clasp. The auction description notes the piece as being in a condition categorized as "1" for the case, indicating it is as new, while the movement and dial are similarly graded as new.

Front view of the Bulgari Diagono Professional reference SD 42 S on a black rubber strap.
Front view of the Bulgari Diagono Professional reference SD 42 S on a black rubber strap. — Antiquorum. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
catalog.antiquorum.swiss
Category
Wristwatch · Diver's wristwatch
Maker / attribution
Bulgari
Reference
SD 42 S
Catalogue / lot identifier
71
Source-reported date
circa 2010
Source-reported place
Not established
Source-reported serial
D 0093

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 Bezel

The timepiece is housed in a tonneau-shaped stainless steel case measuring 42 mm in diameter. It features a diver-oriented construction, utilizing a screwed case-back to achieve its water resistance rating of 2000 meters. The right side of the case incorporates guards that protect the winding crown from accidental impacts.

A unidirectional revolving bezel is mounted to the top of the case, featuring a 60-minute graduated scale for the measurement of decompression times. The design maintains an integrated aesthetic, transitioning into a black rubber strap that is secured by a Bulgari-branded stainless steel deployant clasp.

Evidence for this section
  • “tonneau-shaped, diver’s wristwatch, water-resistant with screwed case-back”
  • “winding crown protected by the crown guards”
  • “60-minute graduated unidirectional revolving bezel for the decompression times”

Dial and Complications

The watch is configured with a black dial featuring central hour, minute, and seconds indicators. Numerical indices are present at the 12 and 6 o'clock positions, with additional markers distributed around the chapter ring. Luminous material is applied to the hands and hour markers to facilitate reading in low-light conditions.

A single horological complication is integrated into the dial layout: a date display positioned at the 3 o'clock aperture. The dial is printed with technical specifications, identifying the watch as a chronometer and denoting its depth rating.

Evidence for this section
  • “black colour dial with centre-seconds”
  • “Date of the month (aperture at 3 o’clock)”
  • ““Chronometer Officially Certified””

Condition and Identification

The auction description assigns a high grade to the object, specifically noting the case as "as new" (Grade 1). The dial and movement are also attributed the highest condition ratings provided in the grading system, suggesting minimal wear to the primary components.

The watch is identified by the model name "Diagono Professional" and the reference number SD 42 S. The individual case number D 0093 is engraved upon the piece. Signatures are reported by the seller on the dial, case, and internal movement.

Evidence for this section
  • “Grading System Grade: AA Very good”
  • “Case: 1 As new”
  • “Signature dial, case and movement”
  • “Case No. D 0093”

Open research questions

  • What specific mechanical calibre is used within the SD 42 S reference?
  • Does the 'D' prefix in the serial number indicate a specific year of manufacture within the circa 2010 window?

Source evidence

Recorded claims and source quotations for Bulgari Diagono Professional Reference SD 42 S
FieldSource-reported valueSource quotation
MakerBulgari“Brand Bulgari”
ReferenceSD 42 S“Ref. SD 42 S”
Case NumberD 0093“Case No. D 0093”
Diameter42 mm“Diameter 42 mm.”
Water Resistance2000 m / 6570 ft“2000 m / 6570 ft”
MaterialStainless steel“Material stainless steel”
Movement typeSelf-winding“self-winding”

Visible details

  • Unidirectional rotating bezel with 60-minute graduation
  • Date aperture located at 3 o'clock position on black dial
  • Integrated black rubber strap with steel deployant clasp
  • Screwed case-back design with crown guards

Research qualifications

  • The source does not explicitly specify the country of manufacture, only referencing Bulgari's associations with Rome and Neuchâtel.
  • The provided year is approximate (circa 2010) and is not linked to a specific production documentation.
  • While the watch is described as a chronometer, the specific certification documentation is not provided.

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

Consulted source

Bulgari - Ref. SD 42 S, self-winding, centre-seconds, date; “Diagono Professional”; stainless steel

Reviewed 2026-10-26 · Record 43463fe792

Terms in this record

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

Other diver's wristwatch records