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Large case: suits wrists 7 in+ (18 cm+)
43 mm case. A bold, statement-size wear. Best suited to larger wrists where the case sits flush.

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Authentication

The Sharkhunter is the black dial variant; any orange, yellow, or silver dial is a misidentified Doxa Sub 300 colorway.

Known issues in the market
  • The Doxa Sub 300 family has multiple colorways with the same case; colorway name must match the dial color.
  • The Sharkhunter name and Cousteau connection are marketing designations for the black dial only.
AreaWhat to checkWhat is correctRed flag
dialBlack Sharkhunter dialBlack dial with Sharkhunter designation; correct Doxa Professional textOrange, yellow, or silver dial presented as Sharkhunter; wrong colorway or dial swap
dialSharkhunter designationSharkhunter text present on the dial or confirmed in the reference documentationMissing Sharkhunter designation; wrong dial variant
caseSub 300 case constructionCorrect Sub 300 case proportionsWrong case proportions; different Sub variant case
Common legitimate replacements
  • Rubber strap; Doxa OEM.
  • Crystal; sapphire standard.
Expert resources: Doxa authorized service; Doxa Sub 300 Sharkhunter product documentation.

Authentication guide

Last reviewed July 2026

The Sub 300 Sharkhunter is DOXA's black-dial colorway, part of the original 1967 Sub 300 lineup alongside the orange Professional (the colorway Jacques Cousteau's crew famously wore). Steel case, external unidirectional dive bezel. A Sub 300 badged "Sharkhunter" with an orange, yellow, or silver dial is a mislabeled sibling colorway, not this reference.

Known reproduction risks

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HIGH RISK

Vintage Doxa Sub 300 dials transplanted into incorrect cases or sold without provenance.

  • Case lug width should match dial width; mismatched dimensions indicate case swap
  • Vintage caseback serial should correlate with the production date recorded in Doxa archives
  • Tritium hands on a modern reissue dial are incorrect

Doxa has an archive service; a reference serial check with Doxa SA is the definitive provenance step for vintage pieces.

MEDIUM

Black dial shade substitution (refinished or relumed dials).

  • Refinished dials show a uniform, slightly plastic-looking gloss without the subtle texture of original matte printing
  • Relumed hands will appear brighter and more uniform than the patina-matched originals

Dial variants by era

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EraDescriptionIdentifiers
1967 to 1977 (vintage original)Original Sub 300 with black dial, printed indices, and tritium lume; early (1967) cases used a domed acrylic crystal, later 1970s production shifted to mineral glass as a cost reduction.
  • Black dial with cream-toned tritium lume plots (now aged to patina) and an orange-tipped seconds hand
  • Printed text with "DOXA" at 12 and "SHARKHUNTER" near 6
  • 300m / 1000ft rating on dial
  • External unidirectional rotating bezel with dive timing scale; steel case
  • Tritium lume on hands and indices (may show age spots)
2021 to present (modern reissue)Modern reissue with sapphire crystal, screw-down crown, and superluminova lume.
  • Black dial with applied luminous indices and an orange-tipped seconds hand
  • Sapphire crystal (vintage originals used acrylic, later mineral glass; sapphire is a modern-only upgrade)
  • "SHARKHUNTER" text on dial near 6 o'clock
  • Screw-down crown
  • "300M / 1000FT" on dial

Service part flags

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Dial

Original: Doxa black; consistent matte shade across the entire dial surface.

Replacement tells
  • Uneven or patchy black finish from a refinished dial (original dials are single-process print)
  • "Sharkhunter" text that is a different font weight or size than catalog examples
  • Applied indices on a piece claimed to be 1967-1977 vintage production (originals are printed)
Crown

Original: Doxa-signed crown; the modern reissue crown screws down.

Replacement tells
  • Unsigned crown on any generation
  • Vintage crown type is not a reliable standalone tell: 1967 examples used a locking crown and later-1970s cost-reduced examples used a pull-out crown, so cross-check against caseback and movement rather than crown type alone

Case back markings

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1967 to 1977 (vintage)
  • Doxa sailing-ship (schooner) logo engraved on caseback
  • Serial number engraved
  • Stainless steel designation
  • "SWISS MADE"
2021 to present
  • Doxa "fish" logo engraved on caseback (replaces the vintage sailing-ship logo)
  • "300M / 1000FT" on caseback
  • Serial number
  • "SWISS MADE"

Movement tells

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  • Vintage Sub 300 typically ran the Doxa caliber (ETA 2783 base); a modern ETA fitted to a claimed original vintage piece suggests a movement swap.
  • Original tritium hands on vintage pieces will show consistent patina; replaced hands with bright new lume on a vintage dial is a mismatch.
  • The modern reissue runs the ETA 2824-2; confirm caliber against seller documentation.
Sources: Doxa Watch SA official product page; WatchUSeek Doxa Subforum; The Doxa Sub Book (Dietrich Stockburger).

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