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Movement tier: unclassified · caliber Longines Cal. L807.24: ETA automatic base, 28,800bph, 42h PR; used in Legend Diver re-edition; simple and robust diving watch caliber · 42h power reserve · see-through caseback
Small case: suits slender wrists (under 6.5 in / 16.5 cm)
36 mm case. A compact, elegant wear. Particularly at home on narrower wrists where larger cases can overhang.

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Authentication

The inner rotating bezel operated by the crown at 3 is both distinctive and the hardest detail to replicate accurately.

Known issues in the market
  • Fakes or incorrectly described examples where the inner bezel ring does not rotate (fixed dial ring rather than a rotating internal bezel).
  • Crown at 9 and crown at 3 functions confused; winding and time setting are at the crown at 9, and the inner bezel is operated from the crown at 3.
  • Cushion case shape that is poorly proportioned on replicas.
  • Period-incorrect hands or indices that do not match the 1960s heritage design language.
AreaWhat to checkWhat is correctRed flag
crownCrown at 3 operates inner rotating bezelCrown at 3 when pulled out rotates the inner bezel ring (inside the dial); rotation is smooth with positive indexing; bezel ring shows minute graduations for dive timingCrown at 3 that does not rotate the inner bezel; inner bezel that is fixed; any watch claiming this reference where both crowns are on the same side
crownCrown at 9 for winding and time settingCrown at 9 winds the movement and sets time and date; positioned on the left side of the case at 9 o'clock; push-pull operationCrown at 9 that is decorative; winding crown on the right side (would indicate a different model)
caseCushion case shapeCase has softened corners giving a cushion silhouette; case diameter approximately 42mm; brushed surfaces with polished case sidesRound case without the cushion shape; excessively angular case corners; case diameter significantly different from 42mm
dialSword hands and vintage-style markersSword-style hands with lume strips; applied indices at hour positions; vintage color palette (cream or white lume on navy dial); "LONGINES" and "LEGEND DIVER" text crispModern-style hands inconsistent with heritage design; printed rather than applied indices; lume that is uneven or missing
casebackCaseback with movement identificationCaseback engraved with model text and water resistance rating; exhibition caseback (if present) shows ETA automatic movement base; Longines reference engravedReference absent from caseback; movement architecture inconsistent with ETA automatic base
Common legitimate replacements
  • Rubber straps are commonly fitted in place of the original; original Longines strap carries Longines markings.
  • Crystal service is advisable if scratched; sapphire replacement maintains water resistance rating.
Expert resources: Longines authorizes via serial at longines.com. WatchUSeek Longines forum has Legend Diver authentication posts. The two-crown inner-bezel mechanism is the definitive in-hand test and requires no tools.

Authentication guide

Last reviewed June 2026

The double-bezel system is what makes the Legend Diver unique in the Longines catalog. The outer graduated bezel is fixed; the inner rotating diver's scale is crown-actuated. Any example without a functioning inner bezel is not a complete Legend Diver.

Known reproduction risks

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MEDIUM

The Legend Diver has enough collector appeal and a distinctive enough design to attract copies. The inner rotating bezel mechanism is the primary authentication test; reproductions typically fit a static inner ring or omit it entirely.

  • Non-functional inner bezel ring: the defining feature
  • Crown at 10 o'clock present but does not engage inner bezel
  • Flat crystal instead of domed (dead giveaway from the profile)
  • Outer bezel that rotates (should be fixed on Legend Diver)
  • Missing or incorrect diver's scale on inner ring

Turn the crown at 10 o'clock and confirm the inner ring moves. Then confirm the outer bezel does not rotate. Those two checks cover the most common reproduction fails.

Dial variants by era

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EraDescriptionIdentifiers
2007 to presentVintage-style dome dial, inner rotating diver scale visible through the crystal, outer minute bezel fixed
  • Black or blue domed lacquer dial with applied indices and large lume plots
  • Outer bezel: graduated fixed minute ring (aluminum, matching dial color)
  • Inner rotating bezel: diver's countdown scale, actuated by crown at 10 o'clock position
  • Date window at 3 o'clock
  • 36mm case (current generation)
  • Distinctive domed crystal to accommodate inner-bezel visibility

Service part flags

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Inner Rotating Bezel

Original: Crown-actuated inner bezel with diver's countdown scale; rotates independently of outer bezel

Replacement tells
  • Inner bezel does not rotate when crown at 10 o'clock is turned
  • Inner bezel replaced with a non-Longines printed ring of incorrect scale
  • Inner scale graduation spacing differs from factory specification
  • Crown at 10 o'clock position does not actuate the inner ring (broken coupling)
Crystal

Original: Domed sapphire to clear the inner bezel system; flat crystal is wrong

Replacement tells
  • Flat crystal that sits lower than the outer bezel rim
  • Mineral crystal substitute for sapphire (scratches easily)
Outer Bezel

Original: Fixed outer ring with graduated minute scale in aluminum, correct color to match dial

Replacement tells
  • Rotating outer bezel (should be fixed)
  • Non-Longines insert with incorrect graduation marks
  • Bezel color mismatch with dial (black bezel with blue dial, etc.)

Case back markings

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2007 to present
  • Solid screwback engraved with LONGINES, reference L3.374.4.96.6, 300M water resistance
  • Cal. L807.24 not shown on caseback; movement inspection required to verify
  • Longines winged hourglass medallion may be engraved on caseback

Movement tells

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  • The L807.24 is a straightforward ETA-based automatic running at 28,800 bph; timing should be clean across all positions with no rate deviation above 10 seconds per day on a well-serviced example.
  • The inner bezel coupling mechanism is the most failure-prone part of this watch; inspect it at the crown and note any slippage, grinding, or irregular advancement.
  • Lume on the dial indices and hands should match in color tone; post-service hand replacement with mismatched lume compound is visible under UV.
  • The domed crystal is prone to scratching on the underside from inner-bezel contact if incorrectly installed; any scratching visible on the crystal underside indicates a fitment issue.
  • Water resistance at 300M relies on correct crown function; any crown at 10 o'clock that does not fully screw down or feels loose is a water-resistance concern and a service flag.
Sources: Monochrome — Legend Diver review; Worn & Wound — Legend Diver review.

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