Hi all. I have received from my dad 4 H. Alken prints from the early 1800s. My dad is now 92 and had these in his bedroom as a child. At some point moisture has effected the matting. I would love to re-mat these using the original frame. How would you go about this? Or should I? They are valued at about $1200 each. See pics. They are all in the same condition as the one I am showing.