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Top-tier supplier movement · caliber Hamilton Cal. H-31: ETA 7753 base, Hamilton-modified, 28,800bph, 60h PR, 27j; used in Intra-matic Chronograph H · 60h power reserve (2.5 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

The column-wheel addition to the ETA 7753 base is the defining modification; its presence through the caseback confirms authenticity.

Known issues in the market
  • The column wheel is added to the standard ETA 7753 cam-actuated base; a 7753 without the column wheel has the wrong movement variant.
  • Pusher feel degrades if the column wheel is worn; test start, stop, and reset feel before purchase.
  • The vintage-inspired dial has multiple color variants; confirm the specific variant matches the reference number.
AreaWhat to checkWhat is correctRed flag
casebackColumn-wheel presence on the ETA 7753 baseSmall ratchet-tooth column wheel visible adjacent to the chronograph bridge; distinct from the standard 7753 camStandard ETA 7753 cam-actuated mechanism without a column wheel indicating the base (non-H) variant
crownChronograph pusher click feelDistinct mechanical click on each pusher press, clean engagement and disengagement of the chronographSoft or vague pusher feel indicating column wheel wear or damage
dialSub-register hand centeringRunning seconds and chronograph minute counter centered in their sub-dialsOff-center sub-dial hands indicating impact or movement shift
Common legitimate replacements
  • ETA 7753 service parts are standard and widely available; the column-wheel modification does not complicate service significantly.
  • Hesalite crystal variants exist alongside sapphire; verify which crystal type is correct for the specific reference number.
Expert resources: Hamilton Intra-Matic documentation at hamiltonwatch.com. WatchUSeek Hamilton subforum for ETA 7753 column-wheel modification identification.

Authentication guide

Last reviewed June 2026

Hamilton Intra-Matic Chronograph H (ref. H38416711), Cal. H-31 on an ETA 7753 base with column-wheel added by Hamilton. Panda dial with tachymeter ring. 40mm steel case. Vintage-inspired chronograph.

Known reproduction risks

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MEDIUM

The panda dial aesthetic is widely reproduced across many brands. The Hamilton-specific details are the authentication anchors.

  • Sub-register size or position slightly off from the 3/6/9 layout
  • Tachymeter numerals with different font or scale starting at a non-standard value
  • Applied index height inconsistent; reproductions use thinner applied bars
  • Hamilton logo font on dial uses slightly different letter spacing in reproductions

Dial variants by era

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EraDescriptionIdentifiers
2017 to presentOngoing production. White panda dial with black subdials at 3, 6, and 9. Applied silver baton indices. Tachymeter outer ring.
  • White "panda" dial with black chronograph registers at 3, 6, and 9
  • Tachymeter scale on the outer chapter ring
  • Running seconds at 9; 30-minute counter at 3; 12-hour counter at 6
  • Date window at 4:30 (some variants) or absent (check specific ref)
  • Push-piece chronograph pushers at 2 and 4 o'clock

Service part flags

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Chronograph Pushers

Original: Round pushers at 2 and 4 o'clock. Column-wheel controlled.

Replacement tells
  • Non-round pusher profile
  • Pushers that engage with a ratchet cam feel rather than column-wheel smoothness
  • Pushers at different positions than 2 and 4 o'clock
Dial

Original: White panda dial with black sub-registers. Tachymeter chapter ring. Applied silver baton indices.

Replacement tells
  • Sub-register colors different from original (e.g., grey instead of black)
  • Tachymeter ring with different scale start point or number groupings
  • Applied indices replaced with printed markers

Case back markings

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2017 to present
  • Hamilton shield medallion or engraved text at center
  • "INTRA-MATIC" designation on caseback
  • Reference H38416711 and serial
  • "SWISS MADE"
  • "100 M / 330 FT" water resistance

Movement tells

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  • Cal. H-31 is based on the ETA 7753. Beat rate is 28,800 bph. A column-wheel is added versus the standard 7753 cam-lever base; column-wheel operation feels distinctly smooth at the pushers.
  • Power reserve is 42 hours. A chronograph with different power reserve claims is not running H-31.
  • The caseback is solid. Confirm movement identity only through authorized service records or by opening with a watchmaker.
  • Running seconds subdial location at 9 o'clock; a chronograph with small seconds at 6 indicates a different movement architecture (Valjoux 7750 style).
Sources: Hamilton official — Intra-Matic.

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