A FOUNDER'S GRADE FROG MECHANISM for an Ohio Tool No. O3 or No. O3 C smooth plane by the Ohio Tool Company, Columbus, Ohio. Fully 98% of the original black japan finish remains on this unused condition 1 3/4" inch width frog. The original screws and washers to secure the frog mechanism to the plane body are included as well. As good as they get. Length = 7.00 Inches (Ref. Id No.: 451227) [Free Shipping]