Marbles knives are considered by many to be a premium hunting knife. Make it a habit to look at every hunting knife that you come across. Marbles are pretty easy to spot because they are typically signed along the top of the blade where it attaches to the handle. Vintage unsharpened examples will sell for several hundred dollars. Reduce the price for damaged handles, sharpened blades, chipped or broken blades and damaged sheathes. A typical used Marbles knife in fair condition will sell for $125-150.