16th-17th century. 5 ¼” length closed. All iron, forged in two pieces. Broad crescent form blade with scroll terminal. Slender tapered tubular grip which served to cover the blade edge and as a grip when opened. The knife actually needs the thumb pressing on the scroll to control it for cutting. . The terminal unslotted and useful as a fid for splicing ropes. Uniform stable rust textured overall as typical for use at sea. Charming and the only example of its type we have encountered.