This vintage Brown & Sharpe USA Model 510 Draftsman's Machinist Protractor has a round head design and is accurate to 5 minutes. It was made in the United States and bears the Brown & Sharpe brand, ensuring its quality and durability. This protractor is perfect for use in metalworking inspection and measurement, and is sought after by professionals in the field. It is a great addition to any collection of precision instruments and will be shipped with care to ensure its safe arrival to the buyer.