The appeal of a discontinued Audemars Piguet replica often comes down to a detail you can no longer buy new: a particular dial, an older movement, or a case that wears differently from its replacement. For someone who wants that exact combination, the pre-owned market becomes the only practical place to look. That helps explain the interest in retired Royal Oak and Royal Oak Offshore references. It does not mean every discontinued fake AP becomes more valuable. Some attract a …