What actually happens to vegetable-tanned leather after five years of daily use?
Five years is long enough to expose every shortcut a tannery ever took. A wallet carried daily, a belt worn through four seasons, a bifold opened and closed a few thousand times — these are not gentle tests. The surface of vegetable-tanned leather is in slow, continuous chemical conversation with the oils, salts, and light it encounters, and after half a decade that conversation has produced something unmistakable: either a deep, even patina that looks like it was painted on by a restorer, or a blotchy, cracked surface that tells a less flattering story. The difference between those two outcomes is not mostly about conditioning routines. It is mostly about what happened at the tannery, sometimes years before the piece was stitched together.
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