This protractor head is clean and in very good working condition. Rotates smoothly through the full range, locks firmly, and the scale is readable. The head is unhardened, but still built to last. The vial is intact and filled. The finish is about 80%, and it has a pleasant patina. Fits standard 12" or longer machinist rules or scales. The reference surface is 7/16" x 7" long. Excellent user.
Protractor is marked:
THE L.S. STARRETT CO. ATHOL, MASS. U.S.A. NO.12
YANKEE
No. 41Y
MADE IN U.S.A.