The stamp was later replaced by Tiffany’s initials, which is one way collectors are able to determine the approximate date that a Tiffany Favrile lamp or other glass item was made.
Just because emails are a quick form of communication, doesn't mean emails, especially business emails, should be written using informal shortened forms of words.
I know, I know, some wag has already pointed out that deliver, unite and defeat was not the perfect acronym for an election campaign, since unfortunately it spells 'dud'.