ETA 7750-420 Crown Wheel
ETA 7750-420 Crown Wheel - Image 2

ETA 7750-420 Crown Wheel

$5.00
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Quantity Discount (%) Price
1 - 2 — $5.00
3 - 4 5 % $4.75
5 - 9 7 % $4.65
10 - 14 10 % $4.50
15+ 15 % $4.25
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Product Description

Genuine ETA 7750-420 Crown Wheel, Made in Switzerland, brand new — the original factory manual winding gear for the ETA/Valjoux 7750 chronograph movement. Receives rotation from the crown stem and transmits power to wind the mainspring during manual winding. Essential replacement for worn or damaged crown wheels. Original ETA part.

Features & Function

  • Genuine ETA 7750-420 — Swiss-made, brand new, original factory part
  • Manual winding gear — receives crown rotation and transmits power to wind the mainspring
  • Crown-stem interface — first gear in the manual winding chain connected to the crown
  • Manual winding counterpart — counterpart of the ratchet wheel (7750-415) for automatic winding
  • Original ETA quality — exact specifications for ETA/Valjoux 7750 chronograph

Specifications

Parameter Value
Brand ETA (Swatch Group)
Part Number 7750-420
Component Crown Wheel
Compatibility ETA/Valjoux 7750 Chronograph Movement
Origin Made in Switzerland
Type Original Factory Part (Genuine ETA)
Condition Brand New

Applications

  • Worn, damaged, or stripped crown wheel replacement in ETA/Valjoux 7750 movement
  • Manual winding failures: crown not winding, mainspring not receiving power
  • Crown mechanism issues: crown wheel teeth worn or not engaging properly
  • Professional movement service and chronograph restoration

FAQ

Q1: Is this a genuine ETA part?
A: Yes — genuine ETA 7750-420 Crown Wheel, Made in Switzerland, brand new. Original factory part from ETA (Swatch Group). Not a generic or replica.

Q2: How do I confirm this fits my movement?
A: Confirm your movement is an ETA/Valjoux 7750 chronograph. Common applications: IWC Portugieser Chronograph, Omega Speedmaster, Tag Heuer Monaco, Breitling Navitimer.

Q3: What does the Crown Wheel do?
A: The Crown Wheel (7750-420) is the first gear in the manual winding chain. It receives rotation from the crown stem and transmits power through the winding train to wind the mainspring when you rotate the crown. It is the manual winding equivalent of the ratchet wheel (7750-415) in the automatic winding system.

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