: thank you but please have a look at this period picture from Heuer
: showing exact this type of dial:
:
: https://picload.org/image/drwcrlll/bildschirmfoto2017-12-13um10.3.png

I was trying to comment about the back of the dial. You have the Z.J mark for the manufacturer Flückiger in St. Imier. Left of that you have the reference number for the dial, normally a one or two digit number, followed by a space, then a four or five digit number.

On your dial I can see the first part of the reference number, but the longer bit is entirely cut out by the date windows. Just seems odd, but maybe they used exactly the same dial stock as the standard chronograph and that explains why it's on the 12 o'clock side.