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DirtyDozen12
·Without a size reference, I'd have to spend more time looking at the gear train and bridges to see which one is different. (Not usually this lazy.)
Does anyone have a photo of a steel cased 13.33z?
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Lépine
·Compare the cocks above the escape wheels, they differ significantly.
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JohnLy
·Nevermind, took a different approach to the problem and found the answer. Staybrite didn’t come into usage for watches until 1930s, hence Valjoux 13 and Valjoux 22GH Staybrites. All but eliminating Staybrite 13.33z from a possibility.
Hi Seiji, I follow many of your posts and find them informative. I thought I would post a couple of pictures of my 13.33Z. As you can see from the pictures the case is marked "acier inox staybrite". The extract from Longines calls out "a wrist-chronograph in metal" also "caliber 13.33Z and was invoiced on 15 April 1935.
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