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Top-tier supplier movement · caliber Longines Cal. L888.4: ETA A31.L01 base with silicon hairspring, 25,200bph, 64h PR, 21j; used in Conquest Classic and Flagship Dress; silicon anti-shock and anti-magnetic · 64h power reserve (2.7 days)
Medium-large: suits wrists 6.5 in+ (16.5 cm+)
40 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.

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Authentication

Fluted bezel wear at the tip of each knurl is polishing damage that reduces case value; verify silicon hairspring via caseback stamp.

Known issues in the market
  • Fluted bezel tips are rounded from polishing; the crisp edges of each flute are removed by over-polishing and cannot be restored.
  • Caseback does not show "Silicon" stamp; buyer expects L888.4 but the watch may be an earlier variant.
  • Case has been polished to a uniform mirror finish; the Conquest Classic has both polished and brushed surfaces that over-polishing eliminates.
AreaWhat to checkWhat is correctRed flag
caseFluted bezel tip conditionEach flute has a sharp, crisp tip with the original geometry; alternating polished and brushed flute faces are distinctRounded flute tips; bezel where polished and brushed surfaces have merged into a uniform finish; any flute that appears machine-recut
caseCase surface finish distinctionPolished surfaces are mirror-bright and brushed surfaces have a consistent directional grain; the transition between surfaces is a sharp lineUniform polished surface where brushing has been removed; brushed surfaces that have heavy scratches from unprotected handling
casebackSilicon designation and caliber confirmation"Silicon" text present on caseback for L888.4 generation examples; caliber number matches seller's representationMissing "Silicon" on a watch claimed to be L888.4; caliber number that does not match the generation being represented
Common legitimate replacements
  • Bracelets on the Conquest Classic are frequently replaced with aftermarket options; original Longines bracelets are signed on the clasp.
  • Pushers or crowns on chronograph variants wear at the gaskets; verify water resistance history on any used example.
Expert resources: Longines.com Conquest Classic reference for case finish specification. WatchUSeek polishing damage assessment guides for identifying over-polished cases.

Authentication guide

Last reviewed June 2026

The Conquest Classic uses the L888.4 (silicon hairspring) in a sport-dress case with a steel bezel. Straightforward to authenticate; the main risk is generation mixing between silicon and non-silicon variants.

Known reproduction risks

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LOW

The Conquest Classic is a current mid-range piece without known reproduction risk. Generation mixing between silicon and non-silicon variants is the only meaningful concern.

  • Non-silicon movement fails magnet test
  • Ceramic bezel where steel bezel is specified
  • Exhibition caseback showing non-Longines rotor

Dial variants by era

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EraDescriptionIdentifiers
2020 to presentSport-dress hybrid with steel bezel, date, applied indices, central seconds
  • Silver, blue, or black dial with applied baton indices
  • Date at 3 o'clock
  • Steel bezel (not ceramic) with polished finish
  • 40mm round case, 46.5mm lug-to-lug
  • No subdials or additional complications

Service part flags

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Steel Bezel

Original: Polished steel fixed bezel; not rotating, not ceramic

Replacement tells
  • Ceramic bezel substituted (wrong material; ceramic is HydroConquest territory)
  • Rotating bezel installed (Conquest Classic has a fixed bezel)
Movement Generation

Original: L888.4 with silicon hairspring in post-2020 examples

Replacement tells
  • Pre-L888.4 movement without silicon hairspring (detectable by magnet test)
  • ETA 2892-A2 base without Longines finishing (visible through exhibition caseback if present)

Case back markings

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2020 to present
  • Solid or exhibition caseback depending on variant
  • Engraved reference L2.786.4.56.6 and 100M water resistance
  • Exhibition caseback shows L888.4 with Longines-signed rotor

Movement tells

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  • Silicon hairspring variants are magnetic-resistant; a basic magnet test distinguishes an L888.4 from an earlier non-silicon movement.
  • 64-hour power reserve is the key spec; run-time significantly below 58 hours warrants mainspring inspection.
  • Hacking seconds should function cleanly at crown position 2.
  • The Conquest Classic date mechanism is identical to other L888-family references; date-advance timing issues are a service matter.
  • An exhibition caseback allows direct movement verification; confirm Longines rotor and Geneva-stripe finishing on bridges.
Sources: Monochrome — Conquest Classic 40.

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