[zwartbles]

Probably a very old variety.Ripens late october, sweet eater.Still some on tree now!

[arobwk]

That's an optimistic question zwartbles!  Obviously a useful late variety though!. 

What else can you tell us about this tree - and how long have you and it been united? 

[Fleecewife]

You can't tell an apple just by looking at it.  There are hundreds of different varieties out there.  The place to ask is Brogdale which has a vast 'library' of apple trees and will possibly be able to identify your tree.  They might even want cuttings from it.
https://www.brogdalecollections.org/fruit-identification/