[Exhibitman]

Great point, Dave. Original negs were valuable; the owners did not want to degrade them by using them to make hundreds of prints, so they routinely created copies and used them. That's why I've always paid the most attention to the markings and slugs, which are hard to fake convincingly, and silvering on certain types of photos (which is nearly impossible to fake). I suppose we'll see some forged stamps and slugs eventually for extremely valuable photos but at least up to now it hasn't been cost-effective to do so.