Rogi
1407
My pleasure :) Thank you for sharing your dad's timepiece with us, if you do get a chance to open the caseback, make sure to see if you can find the serial number, you can order the "Extract of the Archives" from Omega
Basically just the date of production and where it was shipped to, it's an expensive piece of paper (I think 120CHF last time I ordered) but its a nice treat to have along with your timepiece.