Very Old Stamps

Some of you philatelists may be able to help me. These stamps are from my great great great uncle ( I actually had to look him up on my genealogy to figure out the relation lol). He really loved my dad when he was a child and left his entire collection to him. These seem to be some of the oldest, I am pretty sure late 19th century. I looked up the George Washington ones, but they had the same ones from different years. I would like to know value and age if possible. If they prove valuable, I'll post some of the others from asia, europe and other places from around the world, from the 30s, 40s, and 50s.