ETA 7750-8730 Hammer Spring

Quantity	Discount (%)	Price
1 - 2	—	$3.00
3 - 4	5 %	$2.85
5 - 9	7 %	$2.79
10 - 14	10 %	$2.70
15+	15 %	$2.55

Quantity

Discount (%)

Price

1 - 2

—

$3.00

3 - 4

5 %

$2.85

5 - 9

7 %

$2.79

10 - 14

10 %

$2.70

15+

15 %

$2.55

Product Description

Quantity	Discount (%)	Price
1 - 2	—	$3.00
3 - 4	5 %	$2.85
5 - 9	7 %	$2.79
10 - 14	10 %	$2.70
15+	15 %	$2.55

Genuine ETA 7750-8730 Hammer Spring, Made in Switzerland, brand new — the original factory spring component for the ETA/Valjoux 7750 chronograph movement’s reset mechanism. Precisely engineered to provide spring tension that drives the reset hammer, the hammer spring enables the snap-action reset of the chronograph seconds hand to zero when the reset pusher is activated. An essential replacement part for restoring faulty or fatigued hammer spring during movement service. Original ETA part — the professional’s choice for genuine chronograph reset mechanism restoration.

Features & Function

Genuine ETA 7750-8730 — original Swiss-made factory part, brand new, authentic, part number 7750-8730

Reset hammer spring — provides spring tension that drives the chronograph reset hammer to snap the chronograph seconds hand back to zero

Snap-action reset control — precisely calibrated spring force ensures instant, reliable chronograph hand reset at the push of the reset button

Column wheel chronograph mechanism — integral part of the ETA 7750’s reliable cam-switching chronograph platform

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

Specifications

Parameter	Value
Brand	ETA (Swatch Group)
Part Number	7750-8730
Component	Hammer Spring (Reset Hammer Spring)
Compatibility	ETA/Valjoux 7750 Chronograph Movement
Origin	Made in Switzerland
Type	Original Factory Part (Genuine ETA)
Function	Provides spring tension to drive the reset hammer for instant chronograph hand zero-reset
Packing	Original Packing
Condition	Brand New / Genuine ETA

Parameter

Value

Brand

ETA (Swatch Group)

Part Number

7750-8730

Component

Hammer Spring (Reset Hammer Spring)

Compatibility

ETA/Valjoux 7750 Chronograph Movement

Origin

Made in Switzerland

Type

Original Factory Part (Genuine ETA)

Function

Provides spring tension to drive the reset hammer for instant chronograph hand zero-reset

Packing

Original Packing

Condition

Brand New / Genuine ETA

Applications

Replacement of worn, fatigued, or broken hammer spring in the ETA/Valjoux 7750 movement

Repair of chronograph reset failures: chronograph seconds hand fails to reset, partial reset, or slow/lazy reset

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)

FAQ

Q1: Is this a genuine ETA part?
A: Yes — this is a genuine ETA 7750-8730 Hammer Spring, 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. The part number 7750-8730 is the specific hammer spring for the reset mechanism in this movement. Common brand applications include: IWC Portugieser Chronograph, Omega Speedmaster (older 7750 variant), Tag Heuer Monaco, Breitling Navitimer, and many other chronographs using the Valjoux/ETA 7750 platform.

Q3: What does the hammer spring do in a chronograph?
A: The hammer spring is a tiny precision spring in the chronograph reset mechanism. When the reset pusher is pressed, the reset hammer — driven by the hammer spring — strikes the chronograph seconds hand lever, forcing the chronograph seconds hand to snap instantly back to zero. The hammer spring provides the precise spring force needed for that quick, decisive snap-action reset. A worn hammer spring causes lazy, slow, or incomplete reset of the chronograph seconds hand.