Northern Spy seedling, introduced by WT Macoun at the Central Experiment Farm in Ottawa Ontario Canada. Seed sown in 1898, introduced commercially in 1935. (Macoun is most famous for the introduction of the apple with his own name.)
Sandow is a Northern Spy look-alike with similar coloring, shape and ribbing. However, there are some differences in shape details and Sandow is somewhat earlier in ripening. It is a late fall apple. Recommended for fresh eating. Should also be a good pie apple. Very hardy, productive tree. In the 1990s, Francis Fenton purchased a number of trees from St. Lawrence Nursery in Potsdam, NY. One of them produced apples that Francis was unable to ID. He asked me to identify it. I believe that the apple is Sandow.