Hi Art,
thanks for your comment about my Sinn. Actually the model I posted is a Sinn 356 Sa Flieger which is not really uncommon over here in Europe. I value the day-date indication during night shift weeks or holidays, i.e. during periods when you easily forget about those (what paradoxically is one purpose of being on vacation
).
This is a real WS from today after coming home from work:

Besides the version with day-date, I have a similar one, with the GMT function:

(note: if you want, you can hide the yellow GMT hand behind the normal hour hand, so that it cannot be seen)
Concerning the use of a chronograph to measure the breathing rate, I have never ever seen any doctor doing so! As medical students we took the pulse rate and respiratory rates with normal watches, because we could not afford chronographs. Now that we have elegant and expensive chronographs we use them to boil eggs or to check how long our way to work takes us.
These physiological rates are important, but you do not need an accurate measurement. Whether the heart rate is 63 or 76 per minute does not really matter; whether it is 25 or 120 does matter, but there is no need to exactly know them. The same applies to respiratory rates: it may be 8 or 14 per minute, that does not make much difference; whereas a breathing rate of 3 or 30 per minute is indicative of an underlying problem. But this is a "prima vista" diagnosis anyway.
But - this was repetetively stated - it is rarely the factual need that directs our enthusiasm for complicated mechanical watches; rather it is the fascination for the pure possibility to be able to do so hypothetically.
Best regards,
anaesdoc