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Portofino variants

  • forum 2 replies
  • last reply by Ben 20 Feb 2024
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    sweholst
    Apprentice 1 post
    19 Feb 2024, 2:21 p.m. 19 Feb 2024, 2:21 p.m.
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    Looking to expand my collection with a white Portofino Chronograph. Can anyone enlighten me about the differences between reference numbers 391009 and 391028?

    Thanks!

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    Mark Fleminger
    Master 3180 posts
    19 Feb 2024, 11:19 p.m. 19 Feb 2024, 11:19 p.m.
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    Portofino 3910-09 has calibre 75320 and was produced from 2011 to 2019

    Portofino 3910-28 is a revised version with caliber 79320 and was introduced in 2019.

    Kyle2009 likes this.

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    Ben
    Master 1955 posts
    20 Feb 2024, 12:49 a.m. 20 Feb 2024, 12:49 a.m.
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    That is curious, as IWC had utilized the cal 79320 (ETA based) in the even earlier Portofino chronograph, the ref. 3783:

    I am not big on the gold, but I love the chrono pushers on this one. It is curious that IWC went from the ETA-based cal 79320 to the Sellita-based cal 75320, and then back again.

    MarkFleminger and Kyle2009 like this.

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