Welcome,
The Normandy Hubs were made in November the 46th week 1977 so 1977 1978 for the hubs anyway

Your derailleur "apx" prolly a replacement
The VX probably original Look for date code on the VX and the ARX
then go here.
look for the rand and the secret code
Date of Manufacture of Bicycle Components can be used to date a bike: component dating