I found an old Leatherman a number of years ago and know that they are guaranteed for 25 years. Inside each Leatherman is a S/N that has the year on it. I ended up emailing them for information, then it cost me just a couple dollars to mail it to them in Oregon, I think. They returned a new (rebuilt) one, not the same one I sent them (I think the new one had CM in addition to inches).been wearing a Leatherman for about the last 10 years ... broke the tip in 2 of the knives; sooo I paid MORE for a Gerber look-alike. Blades don't lock on the Gerber and the pliers are not needle nose ... so back to the broken Leatherman.
You might do the same.
Here's the link:
Leatherman Warranty Information