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Omega FOIS - crystal options for a swap

  1. RC.57 Nov 8, 2023

    Hello everyone,

    I would like to change the FOIS sapphire crystal. Having looked around I found the below that could fit.
    Could someone confirm how much work would be needed to get them to fit?

    Previous models
    - Hesalite with the black ring PN 063pw5139
    - Hesalite with the silver ring PN 063pz5078

    New models
    - SPEEDMASTER '57 trilogy model Hesalite (does anyone know the part number?)
    - Sapphire from the new 321 looks better in person than the FOIS sapphire (does anyone know the Part number?)

    Thank you for the feedback!