ETA 7750-240 Driving Pinion

Quantity	Discount (%)	Price
1 - 2	—	$10.00
3 - 4	5 %	$9.50
5 - 9	7 %	$9.30
10 - 14	10 %	$9.00
15+	15 %	$8.50

Quantity

Discount (%)

Price

1 - 2

—

$10.00

3 - 4

5 %

$9.50

5 - 9

7 %

$9.30

10 - 14

10 %

$9.00

15+

15 %

$8.50

Product Description

Quantity	Discount (%)	Price
1 - 2	—	$10.00
3 - 4	5 %	$9.50
5 - 9	7 %	$9.30
10 - 14	10 %	$9.00
15+	15 %	$8.50

Genuine ETA 7750-240 Driving Pinion, Made in Switzerland, brand new — the original factory gear component for the ETA/Valjoux 7750 chronograph movement’s gear train. Precisely engineered to transmit rotational power from the barrel to the chronograph mechanism, the Driving Pinion drives the motion work that powers all timekeeping and chronograph functions. An essential replacement part for restoring a worn or damaged driving pinion during movement service. Original ETA part — the professional’s choice for genuine power transmission restoration.

Features & Function

Genuine ETA 7750-240 — original Swiss-made factory part, brand new, authentic, part number 7750-240

Driving pinion — transmits rotational power from the barrel to the gear train to drive all movement functions

Chronograph power transmission — drives the motion work that powers the chronograph mechanism

Precision-machined gear teeth — exact tooth profile for smooth, reliable mesh with adjacent gears

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

Specifications

Parameter	Value
Brand	ETA (Swatch Group)
Part Number	7750-240
Component	Driving Pinion
Compatibility	ETA/Valjoux 7750 Chronograph Movement
Origin	Made in Switzerland
Type	Original Factory Part (Genuine ETA)
Function	Transmits rotational power from barrel to gear train; drives chronograph motion work
Packing	Original Packing
Condition	Brand New / Genuine ETA

Parameter

Value

Brand

ETA (Swatch Group)

Part Number

7750-240

Component

Driving Pinion

Compatibility

ETA/Valjoux 7750 Chronograph Movement

Origin

Made in Switzerland

Type

Original Factory Part (Genuine ETA)

Function

Transmits rotational power from barrel to gear train; drives chronograph motion work

Packing

Original Packing

Condition

Brand New / Genuine ETA

Applications

Replacement of worn, damaged, or stripped Driving Pinion in the ETA/Valjoux 7750 movement

Repair of gear train failures: movement stopping, weak power delivery, or chronograph not functioning

Repair of pinion issues: worn gear teeth, bent pinion, or engagement failure

Professional movement service, overhaul, and chronograph restoration

Certified watchmaker and service center parts supply

FAQ

Q1: Is this a genuine ETA part?
A: Yes — this is a genuine ETA 7750-240 Driving Pinion, 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 7750-240 is the specific Driving Pinion for 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 Driving Pinion do?
A: The Driving Pinion (7750-240) is a small gear in the gear train that transmits rotational power from the barrel to the rest of the movement. The gear train sequence is: Barrel → Driving Pinion → Intermediate wheels → Fourth wheel (seconds) → Third wheel → Cannon pinion (minute) → Hour wheel (hour). In the chronograph, the driving pinion also powers the chronograph motion work that drives the chronograph counters. A worn driving pinion causes inadequate power transmission — the movement may run weak or stop entirely, and the chronograph may function erratically.