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Top-tier supplier movement · caliber ETA 6498-1: Swiss manual-wind pocket-watch-derived caliber, 18,000bph, 46h PR, 17j; large movement with small seconds at 6; used in Tissot Heritage Petite Seconde · 46h power reserve · see-through caseback
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

The ETA 6498-1 nearly fills the caseback window; any small-diameter movement visible through the back has the wrong caliber.

Known issues in the market
  • The ETA 6498-1 is a large-diameter pocket-watch caliber adapted for wristwatch use; it appears much larger than a typical wristwatch movement through the caseback.
  • Any caseback showing a small-diameter rotor or movement has an incorrect caliber installed.
AreaWhat to checkWhat is correctRed flag
casebackETA 6498-1 large-diameter movementLarge-diameter hand-wind movement nearly filling the exhibition caseback window; consistent with pocket-watch caliber proportionsSmall-diameter movement or automatic rotor visible through the caseback; incorrect caliber installed
dialPetite seconde sub-dial positionRunning seconds sub-dial positioned at 6 o'clock; correctly centered within its apertureOff-center sub-dial or seconds hand at the center of the dial rather than the petite seconde position
crownManual-wind crown functionCrown winds the 6498-1 mainspring smoothly; two-position pull for time-settingCrown that does not wind or slips; indicates mainspring or keyless works issue in the 6498-1
Common legitimate replacements
  • ETA 6498-1 service is widely available; the caliber is used across many brands and watchmakers are familiar with it.
Expert resources: Tissot Heritage Petite Seconde documentation at tissotwatches.com. ETA 6498-1 technical documentation for caseback visual identification.

Authentication guide

Last reviewed June 2026

The Heritage Petite Seconde is a manual-wind watch powered by the ETA 6498-1, a large pocket-watch-derived caliber. The movement is visible through an exhibition caseback and is notably oversized relative to other movements at this price point. The small seconds subdial sits at 6 o'clock.

Known reproduction risks

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LOW

Low replica risk. The ETA 6498-1 is a common and genuine movement; the main risk is an honest Tissot with a replaced movement.

  • Exhibition caseback showing a movement with an automatic rotor
  • Beat rate inconsistent with 18,000bph

Dial variants by era

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EraDescriptionIdentifiers
2017 to presentSilver or black dial with Arabic numerals. Small seconds subdial at 6. No date. Tissot T-logo at 12, "HERITAGE" text below. "PETITE SECONDE" above 6. Blued-steel dauphine or leaf hands.
  • Small seconds at 6 o'clock with no central seconds hand
  • "PETITE SECONDE" on dial is the model identifier
  • No date window on this reference
  • "MANUAL WINDING" or no movement descriptor is correct; it is not automatic

Service part flags

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Movement (ETA 6498-1)

Original: Large 36.6mm diameter manual-wind movement, visually oversized behind the exhibition caseback. Distinctive large balance wheel and open-structured plate.

Replacement tells
  • A movement that is visibly smaller than the caseback opening suggests a replacement with a different caliber
  • Any automatic rotor on the movement indicates it has been replaced
Crown

Original: Single crown at 3 for hand-setting and manual winding. This watch has no automatic winding.

Replacement tells
  • If the watch winds without crown interaction, the movement has been replaced with an automatic

Case back markings

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2017 to present
  • Exhibition caseback showing the ETA 6498-1 movement
  • "TISSOT" engraved on the movement bridge or rotor plate
  • Reference T119.405 prefix
  • "SWISS MADE" and serial

Movement tells

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  • The ETA 6498-1 beats at 18,000bph (2.5 Hz), giving a very deliberate tick. If the movement beats faster, a replacement caliber is inside.
  • Power reserve is 46 hours. A manual-wind watch that runs less than 40 hours from a full wind needs service.
  • The 17-jewel layout is visible through the caseback. Counting jewels through the caseback should show 17 red stones.
  • This movement requires manual winding only. Crown resistance should build progressively and release smoothly when fully wound.
Sources: Fratello: Tissot Heritage Petite Seconde Review.

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