Thanks for the amazing website Eric on apple identification I'm looking into it now.
This tree was found in Northwest Pennsylvania, Hardiness zone ~5,
I harvested them late September, I picked some ripe from the tree, many were already on the ground (those went to the
chickens)
Thekla, I don't consider myself knowledgeable with apples but, I'd say the texture is 'medium', not really crisp nor mushy.
Here is another pic showing more detail of the apple: