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Chronograph Subdial LAYOUT

  • 3 -- 6 -- 9 (Valjoux 7753 standard)

    Votes: 65 61.9%
  • 6 -- 9 -- 12 (Valjoux 7750 standard)

    Votes: 25 23.8%
  • 12 -- 3 -- 9

    Votes: 1 1.0%
  • 12 -- 3 -- 6

    Votes: 0 0.0%
  • 3 -- 9

    Votes: 25 23.8%
  • 12 -- 6

    Votes: 1 1.0%
1 - 4 of 4 Posts

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Really? Please explain
It is a matter of geometry and the seconds subdial's critical 6 - 12 axis. When at the 6 position, the minute hand will be parallel to that axis occasionally, but regularly, blocking the second hand from view. With the subdial at 9, the hands can never be parallel to the 6 -12. Of course, some of the subdial will be covered with the minute hand, and you will "lose" the second hand when the minute hand covers the 3 - 9 axis, but that is not as important given that most people want to know the exact minute vice, 15 seconds prior to the minute.

All of this may be a reason why two versions of the famous Unitas handwound movement were created -- 6497 & 6498.

Good question, heb
 

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Thin hands are an absolute must for chrono legibility. I’ve seen some that at first glance are nice looking watches, but then notice the fat hands that will do a lot of subdial blocking.
Probably the worst chronograph on the market as far as blockage is concerned is IWC's new Pilot Chronograph. Super fat hands and a chrono second hand's counterweight that ALWAYS blocks the upper portion of the constant second hand. I have one.
 
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