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The Encyclopedia of Horology

Component · Centre seconds pinion

IWC Calibre 852 Centre Seconds Pinion (Ref. 275)

Partially verified

This item is an individual center seconds pinion (pignon de seconde au centre) associated with IWC calibre 852. Listed under reference 275, the source records a height measurement of 5.10 mm. Visually, the component consists of an elongated steel arbor featuring a reduced-diameter pivot at one extremity and an integrated toothed pinion gear near the opposite end, from which a short pivot extends. The retailer describes the part as being in good condition.

Centre seconds pinion with toothed wheel and extended central arbor against a plain surface
Centre seconds pinion with toothed wheel and extended central arbor against a plain surface — Passion Chrono. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
www.passionchrono.com
Category
Component · Centre seconds pinion
Maker / attribution
IWC
Reference
275
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
Not established
Country
Not established

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Identity and Calibre Association

The item is catalogued by the source under reference 275 and designated as an IWC centre seconds pinion ("Pignon de seconde au centre"). The listing specifies an association with IWC Calibre 852 and records a height dimension of 5.10 mm.

The seller reports the condition of the part as "Bon état Good conditions". Technical tolerances, packaging, and date of manufacture are not recorded in this source.

Evidence for this section
  • “IWC Calibre 852 Ref: 275 Pignon de seconde au centre Centre seconds pinion Ht: 5,10mm”
  • “Bon état Good conditions”

Observed Morphology and Construction

Visual observation of the component shows a metallic arbor featuring a reduced-diameter upper pivot at one extremity.

An integrated toothed pinion wheel is positioned near the lower end of the arbor, with a small protruding pivot extending beneath the toothed section.

Evidence for this section
  • “Metallic arbor with a reduced-diameter upper pivot.”
  • “Integrated toothed pinion wheel positioned near the lower arbor end.”
  • “Small protruding pivot extending below the toothed gear section.”

Source Metadata Discrepancies

The source listing presents internal discrepancies between its primary text and the tabulated product details. While the title and description denote an IWC 852 centre seconds pinion under reference 275, the "Product Details" section lists "Caliber 854" and classifies the part as a "toggle spring".

Because of these conflicting field values in the source entry, technical compatibility across calibres and intended classification cannot be definitively determined from this document alone.

Evidence for this section
  • “Reference : IWC 852 275”
  • “Product Details Caliber 854 Type of movement parts toggle spring”

Open research questions

  • Does reference 275 interchange between Calibre 852 and subsequent automatic calibres such as Calibre 854, or is the 5.10 mm height unique to Calibre 852?
  • Why does the database metadata list the component as a toggle spring under Calibre 854 despite the title and description specifying an 852 centre seconds pinion?
  • What are the precise factory dimensions, leaf count, and pivot specifications for IWC reference 275 according to official technical documentation?

Source evidence

Recorded claims and source quotations for IWC Calibre 852 Centre Seconds Pinion (Ref. 275)
FieldSource-reported valueSource quotation
Part Reference275“Ref: 275”
CalibreCalibre 852“IWC Calibre 852”
Component TypeCentre seconds pinion“Centre seconds pinion”
Height5.10 mm“Ht: 5,10mm”
Reported ConditionGood conditions“Bon état Good conditions”
Listing Price€35.00“€35.00”
Original French DescriptionPignon de seconde au centre“Pignon de seconde au centre”
Conflicting Metadata CalibreCaliber 854“Caliber 854”
Conflicting Metadata Typetoggle spring“Type of movement parts toggle spring”

Visible details

  • Metallic arbor with a reduced-diameter upper pivot.
  • Integrated toothed pinion wheel positioned near the lower arbor end.
  • Small protruding pivot extending below the toothed gear section.

Research qualifications

  • Product metadata inconsistently mentions Caliber 854 and toggle spring in the template text, conflicting with the primary title and description specifying Calibre 852 reference 275.
  • Listing does not provide date of manufacture or packaging.

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

IWC 852 - 275 Pignon de seconde - Centre seconds pinion IWC 852 275 Passion Chrono

Reviewed 2026-10-21 · Record 7a158c4457

Terms in this record

Glossary explanations for terms named in this object’s record.