This is an "Interframe" folder. This means the handle's frame is a single piece of metal, which is precisely milled out to accept an inlay of natural material.

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Hoel only made a small number of knives,  all very high quality inter frame folders,  many embellished with engraving and gold inlays by some of the world’s finest artists.

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This knife was made in 1982 to raise fund to protect the killing of sheep, a man could only kill one Bighorn Sheep in his lifetime.

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The subject of the engraving is the head of a Bighorn Sheep, directly referencing the knife's purpose. The engraving is located on the metal bolsters at both ends of the handle, executed in a highly dimensional relief style, possibly with gold inlays to highlight the horns, rendering the details lifelike.

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The knife was marked “ADBOSS-1” and is the only one in existence.