Gerald, one of our bygone hobbies was digging around in old dumps for whatever relic, usually glass bottles, we could find.
We were always amazed at how well old leather shoes stood the years. We were usually in dumps that were about, or just short of, 100 years. In almost every one, we could find old leather shoes. The leather would, of course, be hard, but still tough and still there. Certainly nothing special to preserve them would have been put on, prior to throwing them away, but they still stood the years, out in the weather, until they were often covered by 100 years of build up on top of the heap.