Description
Monopoussoir chronograph with 8 days of power reserve.
All watches using this caliber:

IW5151-05
IWC Portofino Monopusher Tribeca Film Festival 2015

IW5151-03
IWC Portofino Hand-Wound Monopusher White Gold / Slate

IW5151-04
IWC Portofino Hand-Wound Monopusher Red Gold / Silver

IW5153-01
IWC Portugieser Hand-Wound Monopusher Laureus

IW515106
IWC Portofino Hand-Wound Monopusher Platinum / Laureus Charity Night Milano 2015