scapa
·Looks like height is 12mm according to SJX
https://watchesbysjx.com/2020/01/longines-heritage-classic-chronograph-1946-review.html
but I suspect that's the case height... plus crystal, probably 13mm at least from the pic below from SJX.
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Thanks for the pic and link. Interesting to read about the historical piece, ugly duckling though it be, that this modern 1946 draws on.