Marked Duff on the blade. The included paper is about Bill Duff custom knives.Canada geese on the handle. Come visit us at Markers Antiques in Spooner WI. The item "Vintage Hunting Type Knife In Sheath Marked Duff & Bill Duff Custom Knives" is in sale since Wednesday, December 14, 2016. This item is in the category "Collectibles\Knives, Swords & Blades\Collectible Fixed Blade Knives\Vintage Fixed Blade Knives\Custom & Handmade". The seller is "neatstuffantique" and is located in Spooner, Wisconsin. This item can be shipped worldwide.