What to call NWoD before the update?
The game's name plus 'NWoD pre-God Machine' would be suitable for a subject line, I'd say, and you can specify that it's the NWoD ruleset prior to the God Machine update in the body of the advertisement. A suitable amount of information conveyed in a straightforward manner, so people know what you're looking for right from the get-go.
Good luck with your game!