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Top-tier supplier movement · caliber ETA Powermatic 80 (Tissot): Swiss automatic, 21,600bph, 80h PR, 21j; Tissot-branded ETA Powermatic 80; used in PRX, Le Locle, and Seastar 1000 · 80h power reserve (3.3 days) · see-through caseback

Also uses ETA Powermatic 80 (Tissot)

Tissot Le Locle Powermatic 80 Ref. T006.407.16.053.00, silver dial, steel case
Tissot
Le Locle
Tissot PRX 35 Powermatic 80 Ref. T137.207.11.031.00, silver dial, steel case
Tissot
PRX
Tissot Seastar 1000 Powermatic 80 Ref. T120.407.11.041.00, blue dial, steel case
Tissot
Seastar
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 integrated bracelet clasp must be signed Tissot; unsigned aftermarket bracelets are common on the used PRX market.

Known issues in the market
  • Aftermarket integrated bracelets are widely available for the PRX; unsigned clasps indicate a non-original bracelet.
  • The integrated bracelet taper and clasp are specific to the PRX; generic bracelets with incorrect taper proportions are a common substitution.
AreaWhat to checkWhat is correctRed flag
braceletTissot-signed claspClasp signed Tissot with correct engraving depth and font; deployment mechanism operates smoothlyUnsigned clasp or aftermarket clasp with incorrect font; indicates non-original bracelet
braceletIntegrated bracelet taperBracelet tapers smoothly from the lugs to the clasp in a continuous curve specific to the PRX designIncorrect taper angle or bracelet that does not integrate flush with the case lugs
casebackPowermatic 80 movement identityETA Powermatic 80-based movement visible through exhibition caseback on variants with display back; Tissot signedMovement architecture inconsistent with the Powermatic 80 family on display-back variants
Common legitimate replacements
  • Integrated bracelet links can be removed for sizing; verify the correct number of links are present and not lost.
  • Powermatic 80 service interval is nominally 8 years; a service history document adds confidence.
Expert resources: Tissot PRX documentation at tissotwatches.com. WatchUSeek Tissot subforum for bracelet identification and Powermatic 80 service notes.

Authentication guide

Last reviewed June 2026

The PRX Powermatic 80 is the most-copied current Tissot. The integrated bracelet geometry, caseback medallion, and dial printing quality are the three checkpoints that separate originals from replicas.

Known reproduction risks

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HIGH RISK

Direct PRX replicas targeting the Royal Oak-adjacent aesthetic at sub-$200 price points.

  • Bracelet integration point has a visible gap or step at the lug
  • Middle links hollow or have a folded construction visible from the side
  • Dial text poorly aligned, especially the "SWISS MADE" line
  • Date window aperture not centered on the date disc print
  • Caseback medallion stamped flat rather than applied and raised

The PRX replica market accelerated after the model sold out globally in 2021. Exercise the same skepticism you would with an AP Royal Oak replica at this price point.

Dial variants by era

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EraDescriptionIdentifiers
2021 to presentSunburst dial in blue, black, silver, or green. Applied "T" logo and "TISSOT" text at 12. "PRX" in a smaller font below the logo. Powermatic 80 text printed at 6 o'clock beneath the center. Date window at 3 with a silver surround ring.
  • Thin applied hour markers with polished facets
  • "SWISS MADE" text at 6, below the Powermatic 80 inscription
  • Date window ring matches case finishing
  • Dial edge sits flush with the inner bezel wall

Service part flags

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Bracelet

Original: Fully integrated brushed-and-polished steel links. The center links are solid, not folded. The taper from 20mm at the lugs to the clasp is a continuous, uninterrupted curve.

Replacement tells
  • Hollow center links rattle audibly when shaken
  • The taper has a visible seam or step where an aftermarket bracelet was fitted
  • Clasp markings do not read "TISSOT" with the Swiss cross
  • Center link finish differs in grain direction from factory
Caseback

Original: Screw-in caseback with a Tissot medallion in the center and "TISSOT" / "SWISS MADE" text around the perimeter. The medallion is applied, not stamped.

Replacement tells
  • Medallion appears pressed rather than applied
  • Caseback text font weight differs from factory examples
  • Thread engagement feels loose or imprecise
  • No serial number engraved on the caseback rim
Crown

Original: Signed Tissot crown with crosshair-T logo. Brushed finish. Pushes in to neutral, pulls to time-set.

Replacement tells
  • Logo indistinct or off-center
  • Crown diameter oversized relative to the pusher on the ETA Powermatic 80 crown tube

Case back markings

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2021 to present
  • Applied Tissot medallion in center
  • "TISSOT" arched at top, "SWISS MADE" arched at bottom
  • Reference number engraved on inner ring
  • Serial number on outer ring
  • Six notches for caseback wrench

Movement tells

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  • The ETA C07.611 (Powermatic 80) beats at 21,600bph, which gives a noticeably slower tick than a 28,800bph movement. If the watch ticks faster, it does not have this movement.
  • Silicon hairspring: the movement is non-magnetic to 15,000 A/m. A strongly magnetic sample placed near the escape wheel should have no effect; if the watch stops it may indicate a substituted movement with a conventional steel hairspring.
  • The movement should run 80 hours from full wind. A watch that stops before 60 hours has either an underperforming sample or a replacement movement.
  • Rotor engrave reads "ETA" on the mass; Tissot-branded versions show "Tissot" on the oscillating weight. A plain steel rotor with no markings is not correct.
Sources: Tissot PRX Powermatic 80 official page; Fratello: Tissot PRX Powermatic 80 Review.

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