Now I understand

Jun 30, 2021,19:27 PM
 

Thanks Heiko and Steve
So it looks like the 3810 and 3817 both have the 12 hour register at the 6 o'clock position and the 3815 can only count up to 60 minutes as a chrono. I guess you could count the hours on the 3815 using the bezel.
Steve

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Questions on the XXI 3815 and 3817 for those that actually have them.

 
 By: redbox : June 30th, 2021-15:41
Years ago I had a XX Transatlantique and now looking to buy another type XX/ XXI. I haven't found a good answer about the sub dial at 3 o'clock. Some of the reviews say it is a hour counter for the chrono and others say it is to tell day/night time. I hav... 

Breguet 3817 - subdial at 3 o'clock tells you, wether it is night or day.

 
 By: hartenfels : June 30th, 2021-15:52
Hi there, I have a 3817 and the subdial at 3 o'clock is fix-linked with the standard hour hand and shows you night/day. Best, Heiko

Time Zone indicator

 
 By: Steve (UK) : June 30th, 2021-16:01
It is for pilots crossing international times zones. Top section is 6am to 6pm Bottom section is 6pm to 6am Image shows the time as approaching noon. Hope this helps ...  

Now I understand

 
 By: redbox : June 30th, 2021-19:27
Thanks Heiko and Steve So it looks like the 3810 and 3817 both have the 12 hour register at the 6 o'clock position and the 3815 can only count up to 60 minutes as a chrono. I guess you could count the hours on the 3815 using the bezel. Steve