If you've ever had a knife lose its edge or get nicked or dinged, you know what a bummer it can be. Replaceable blade knives help you combat that issue. Instead of performing maintenance and sharpening on your knife's blade, you can just pop a whole new blade on! This Old Timer folding replaceable blade knife can open with one hand with the help of its thumbstud, and it locks open solidly courtesy of its liner lock.