Unclear ,
can you get hold of the Studies in the Scriptures, many kingdom halls have them. Otherwise go to the Bble Students sites for what the originals said, Bible Students still believe in what Russell taught and have his works searchable on the internet. Try either www.agsconsulting.com under resources or www.mostholyfarith.com/bible/Reprints
www.jwfacts.com has a section outlining what was expected for each date and the quotes. It was very plainly said that the rapture would happen in 1881, that the end would come in 1914 and later that the resurrection would happen in 1925.
He has said that he would change his mind if shown evidence. Make sure you hold him to his word. As soon as he sees these things his mind will try to wiggle out of accepting that it is an issue. Make him reinforce to you that if these things are wrong, or were said that it is an important deception. Do this before he sees any of the information on dates or 607, make him say againg that these are issues that will prove whether the Watchtower Society is directed by God.
My Cousin in Law said to a friend of mine that the WTS never predicted the end would come in 1914. She told him the article. So he drove to our Kingdom Hall and found it. When he drove back to her he suddenly changed his tune, saying "Well it proves they are Gods religion that they are honest enough to still have the books". That is classic cognitive dissonance, and you need to prepare your husband for it, rather than let it slap him in the face and find he runs from what he has already told you.