ETA 7750-423 Crown Wheel Core

Quantity	Discount (%)	Price
1 - 2	—	$8.00
3 - 4	5 %	$7.60
5 - 9	7 %	$7.44
10 - 14	10 %	$7.20
15+	15 %	$6.80

Quantity

Discount (%)

Price

1 - 2

—

$8.00

3 - 4

5 %

$7.60

5 - 9

7 %

$7.44

10 - 14

10 %

$7.20

15+

15 %

$6.80

Product Description

Quantity	Discount (%)	Price
1 - 2	—	$8.00
3 - 4	5 %	$7.60
5 - 9	7 %	$7.44
10 - 14	10 %	$7.20
15+	15 %	$6.80

Genuine ETA 7750-423 Crown Wheel Core, Made in Switzerland, brand new — the original factory component for the ETA/Valjoux 7750 chronograph movement winding mechanism. Precisely engineered to engage with the castle wheel during manual winding, the crown wheel core transmits rotational torque from the crown to the movement’s mainspring barrel. An essential replacement part for restoring worn or damaged crown wheel components during movement service. Original ETA part — the professional’s choice for genuine movement restoration.

Features & Function

Genuine ETA 7750-423 — original Swiss-made factory part, brand new, authentic, part number 7750-423

Crown wheel core — central hub component of the winding mechanism, responsible for torque transmission from the crown to the mainspring barrel

Precise gear engagement — machined to exact tolerances for smooth, reliable meshing with the castle wheel during winding

Original factory quality — exact dimensional specifications for perfect fit in the ETA/Valjoux 7750 movement

Critical winding component — essential for both manual winding and automatic rotor engagement in the 7750 platform

Specifications

Parameter	Value
Brand	ETA (Swatch Group)
Part Number	7750-423
Component	Crown Wheel Core
Compatibility	ETA/Valjoux 7750 Chronograph Movement
Origin	Made in Switzerland
Type	Original Factory Part (Genuine ETA)
Function	Transmits winding torque from crown to mainspring barrel via castle wheel engagement
Packing	Original Packing
Condition	Brand New / Genuine ETA

Parameter

Value

Brand

ETA (Swatch Group)

Part Number

7750-423

Component

Crown Wheel Core

Compatibility

ETA/Valjoux 7750 Chronograph Movement

Origin

Made in Switzerland

Type

Original Factory Part (Genuine ETA)

Function

Transmits winding torque from crown to mainspring barrel via castle wheel engagement

Packing

Original Packing

Condition

Brand New / Genuine ETA

Applications

Replacement of worn, damaged, or stripped crown wheel core in the ETA/Valjoux 7750 movement

Professional movement service, overhaul, and chronograph restoration

Certified watchmaker and service center parts supply

Restoration of 7750-based chronograph movements (IWC, Omega, Tag Heuer, Breitling, and other brands using 7750)

Repair of winding mechanism failures: grinding, slipping, or failure to engage

FAQ

Q1: Is this a genuine ETA part?
A: Yes — this is a genuine ETA 7750-423 Crown Wheel Core, Made in Switzerland, brand new. It is an original factory part from ETA (Swatch Group), the world’s leading movement manufacturer. Not a generic or replica part.

Q2: How do I confirm this part fits my movement?
A: Confirm your movement is an ETA/Valjoux 7750 chronograph (or compatible derivative). The part number 7750-423 is the specific crown wheel core for this movement. Common brand applications include: IWC Portugieser Chronograph, Omega Speedmaster (older), Tag Heuer Monaco, Breitling Navitimer, and many other chronographs using the Valjoux/ETA 7750 platform.

Q3: What is a crown wheel core?
A: The crown wheel core is the central hub/body of the crown wheel assembly — the component that engages with the castle wheel when manually winding the watch. It transmits rotational torque from the crown through the clutch system to the mainspring barrel. A damaged or worn crown wheel core causes winding failure: grinding, slipping, or inability to tension the mainspring.