I do not know for sure whether it is gold filled or solid gold, but considering it is made by Tiffany I would assume it is solid gold - I do not know though. Both knives have some wear - a lot of little scratches and the gold knife has some dings.
The gold knife also has some rust spots on the blades. This item is in the category "Collectibles\Knives, Swords & Blades\Collectible Folding Knives\Vintage Folding Knives\Factory Manufactured".The seller is "piccolo3200" and is located in this country: US. This item can be shipped to United States.