This is the Pentel mechanical pencil "Orenz Nero." The barrel is marked "orenz Pentel 0.3." Pentel is a Japanese stationery manufacturer, and its mechanical pencils are known for their high quality. The 0.3mm lead is very fine, suitable for precise writing and detailed drawing. The Orenz Nero features an automatic lead advance mechanism, allowing you to write continuously until the lead runs out after a single click. It's a popular series among drafting pencil enthusiasts.