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simple answer

The simple answer is that there are minimal differences between cal11 and cal12 and no difference in dial layout, while there are more obvious differences between cal11/12 and cal.15.

: I am sure that there is a simple answer for this, but why did Heuer
: change to a "15" serial prefix for the 15s, but
: retained "11" for the 12s?

: thanks, Dan

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