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Some specifications for this reference are on file; the record is incomplete.

Universal Genève · Polerouter

Polerouter

Ref. 20357-2 — “Polerouter, micro-rotor”

discontinuedMicro-rotor eraPartially documentedLast reviewed Not yet reviewed

Missing informationCore fields not yet documented for this reference: Case diameter, Water resistance, Dial

Lineage← 2021720357-2Compare with previous

Reference photography not yet on file

The micro-rotor Polerouter. The caliber 215 was, at 4.1mm, the thinnest automatic movement in the world when it appeared, and its 57-hour reserve was exceptional for 1955. The catalog records this reference as documented in its identity and partial in its specification: Universal Genève used a large number of case references across the line and the mapping between them, the dial executions and the successive micro-rotor calibers is not fully established in public sources.

Some specifications for this reference require verification against manufacturer documentation.

At a glance

Brand
Universal Genève
Collection
Polerouter
Reference
20357-2
Production
1955
Caliber
215
Case material
Stainless steel; gold-capped and solid gold executions

Related references

Same Movement

3919

Reference family timeline

Every generation in this lineage in production order. Spans are as documented; an open end means the reference is current or its end year is not established.

  1. 20217“Polarouter, first series”

    Polerouter · 138SS

    1954–1955
  2. 20357-2“Polerouter, micro-rotor”

    Polerouter · 215

    1955This reference