Case warrants each knife against defects in materials and workmanship for the life of the owner. Case will repair or replace at its option, and where the original model is unavailable it will substitute a current-line knife. Normal wear and misuse are excluded, though misuse damage can often be repaired for a fee.
Case's coverage runs for the life of the owner rather than the life of the knife. That is the standard phrasing across most of the traditional American brands and it is worth reading carefully if you are buying secondhand.
The remedy is Case's choice: repair, or replacement with a current-line knife if the original is no longer made.
Normal wear is not covered. Neither is misuse, which Case names explicitly: using a knife as a hammer, chisel or pry bar.
Usefully, Case will often repair misuse damage for a fee rather than simply declining it. That is a repair service rather than warranty work, but it means a damaged knife is not necessarily finished.
Case requires a repair request through caseknives.com. See how to file a Case warranty claim.
Warranty terms are set by the manufacturer and can change. The maker's own warranty page, linked below, is the authority. We repeat what it says; we do not extend it, and a retailer cannot promise coverage a manufacturer has not offered.