​Variation ofB-20200. It has patent date April 12, 1892 on shank. Patent No. 472,805 by Earnest J. Forest for method of construction. Assigned to Russell & Erwin. Sown in 1894 Russell & Erwin catalog page 154 and the #2 Supplement  issued in 1896 page 90. The embossed plate was also used withB-20200andM-15900. Click on each photo below to view additional images and information.