IWC caliber 51950
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51950 description
IWC's caliber 51950 is a self-winding movement with tourbillon and perpetual calendar. It is based on the earlier 51900 - with the addition of the module for the calendar.
All watches using the IWC 51950 movement:

IW5045-01
IWC Portuguese Perpetual Calendar Tourbillon Edition “150 Years” Red Gold / White

IW5045-05
IWC Portuguese Perpetual Calendar Tourbillon Platinum / Silver

IW5045-04
IWC Portuguese Perpetual Calendar Tourbillon Armor Gold / Blue / Boutique Edition

IW504803
IWC Big Pilot's Watch Perpetual Calendar Tourbillon Le Petit Prince

IW5045-06
IWC Portuguese Perpetual Calendar Tourbillon Platinum / Blue