the only two dupes I have are a Spyderco FG Manix, one for EDC, one for backup in case something happens to the first one, and a Dodo, one PE, one SE, both blue G-10, technically these two aren't strictly dupes, as one is SE, one is PE, but one is there to back up the other
neither of these knives are considered "collectible" knives, if something happens to one of them, the other will be brought into service while the EDC is sent in for repair