GrailAtlasAn independent mechanical watch reference
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ETA

ETA 7750

Swiss lever · introduced 1973
ETA 7750 movement
Photo by Ofbarea (CC0), via Wikimedia Commons · CC0A loose 7750 in a movement holder, stem fitted, seen from the automatic-winding side. This is the lead image on the Valjoux article across the English, Italian, Spanish, Catalan and Finnish Wikipedias, and the cam-and-lever chronograph architecture under the rotor matches a 7750 rather than a column-wheel caliber.
Beat rate
28,800 vph
Power reserve
42h
Jewels
25
Introduced
1973
Escapement
Swiss lever

The ETA 7750 is the dominant cam-and-lever chronograph movement in the Swiss industry, not a column-wheel design. Its horizontal (lateral) clutch is prone to a small jump at chronograph start, a known tradeoff traded for simpler production; the cam-and-lever actuation itself is simple enough that trained watchmakers worldwide can service it reliably. The movement is thick by modern standards, which explains its predominance in tool and pilot chronographs rather than dress pieces.

Specifications

Beats per hour
28,800
Jewels
25
Power reserve
42h
Diameter
30.4mm
Height
7.9mm
Escapement
Swiss lever
Introduced
1973
Finishing
Commercial
Service interval
5 years
Service cost tier
Mid-range

Complications

chronographdatedayflyback capable

Known service issues

  • Chronograph cam-lever wear leads to drift at chronograph start after 10-plus years
  • Hour-totalizer wheel can lose a tooth under heavy chronograph use
  • The rotor weight and thickness make the movement less suitable for slim cases

Notable in

  • IWC Portugieser Chronograph IW371401
  • Breitling Navitimer B01 (earlier versions)
  • TAG Heuer Carrera CV2010
  • Zenith El Primero 36000 VPH (shares architecture)

Buying advice

Practical guides for buying a watch with this caliber on the pre-owned market:

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