If someone said "the original pledge of allegiance" I think most people would interpret that as being about its form before any alterations. And so, the 1892 "I pledge allegiance to my Flag and the Republic for which it stands, one nation, indivisible, with liberty and justice for all."
(Before the 1923 addition of "the Flag of the United States of America" and the 1954 addition of "under God")
(Before the 1923 addition of "the Flag of the United States of America" and the 1954 addition of "under God")