Dear All ,
Who has ever see a "Civilian" 5510 with a military caseback ???
Here is a scan of the case back 'sorry for bad quality)
the watch is from I.1958 .
The dial is the "civilian" 5510 dial. the "200m=660 ft" has turned to a black color but it is fun
to see because it is a little in relief.
I found this link in VRF :
and the caseback engraving is exactly the same of the picture number 2 :
2) followed by a 6 digits number
Mine is also starting by 145xxx.
Thanks for your helps .