Cutco Model 5721 - Fisherman's Solution Filet Knife with 6" - 9" adjustable Straight Edge blade and 5.4" handle. Pivoting sheath doubles as a gripper, built-in notched line cutter and sharpening stone:
Amazon.com: Cutco Fisherman's Solution (Black) #5721 : Home & Kitchen
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Fisherman's Solution® | Fishing Knives & Fillet Knives by Cutco
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Amazon.com: NEW Model 5721 CUTCO Fisherman's Solution with 6" - 9" adjustable Straight Edge blade and 5.4" handle. Pivoting sheath doubles as a gripper; built-in, notched line cutter and sharpening stone. :
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Fisherman's Solution® | Fishing Knives & Fillet Knives by Cutco