Vintage slip joint pliers marked Diamond Duluth USA, model N16, measuring approximately 6½ inches in length. Manufactured by Diamond Tool & Horseshoe Co. of Duluth, Minnesota. This example features a stamped Diamond logo over a diamond-shaped emblem, knurled steel handles, and a classic adjustable pivot for gripping varied sizes. Originally chrome-plated, with visible chipping and surface wear. Slight wobble at the joint, consistent with age and use. A durable and collectible piece of mid-century American toolmaking, valued for its rugged design and brand legacy.