Well, it's probably double edged.
In the live action production, Mary Martin returns to the underground hide-out under a tree, not yet aware that Tinkerbell has been poisoned. Tinkerbell cries out for help.
Mary Martin replies, "Just a minute, Tink, while I sharpen my dagger."
Most of the items that the Lost Boys use looks recycled or stolen. In that same manner, my guess is that Pan's dagger was stolen from a pirate. Hook's band appears mostly English, and the story is from the 1800's. Ergo, I believe that this dagger was procured from the manufacturer that made most of the export cutlery in that length at that time, like the Bowie knife.
I believe Pan's dagger to be a Sheffield Arkansas Toothpick.