Hey, Lauver had the following in GG:
"It's not uncommon to run into mixed series codes in tools sets. I don't think there is any noticable difference between the -V-, =V=, or G series sockets. And, for all practical purposes, they're all made by the same company and all made in U.S. facilities. I wouldn't lose any sleep over it."
I have often found G series mixed in with V series. I throw them in with the other non-v series tools.
Whats your thoughts on the G series?
Chilly