I believe this knife is from late 50s early 60s. The sheath is much later.
Ive drawn this conclusion based on the spacers and letter alignment in the tang stamp on the knife. The stacked leather handle is still tight. No broken or cracked washers.
Only an offer to solve a problem. The item "Randall Knife Model 4 Vintage Mid 20th Century Very Good-Excellent Cond" is in sale since Tuesday, December 31, 2019. This item is in the category "Collectibles\Knives, Swords & Blades\Collectible Fixed Blade Knives\Vintage Fixed Blade Knives\Custom & Handmade". The seller is "dandssales2016" and is located in Tampa, Florida. This item can be shipped to United States.