Comments:
Lumes....
big difference between just walking back into the flat, from a sunny day and "charging" them, for best result...The 373 and 604Firenze just coming in form the sunny outside. The vetust 5218/207A (32 years old Tritium) after vigourous charge, the 604Firenze lightly charged and finally the 373 on steroids 
An "illuminating" post dear friend Sergio!! All wonderful Panerais... but that 5218... Wow! And tritium still working after 32 years! Keep enjoying and loving my dear friend and thank you for sharing!
Ciao my dear friend! Abel