Deere and Mansur wrench

This is a wrench for a Deere and Mansur planter I found in Iowa recently. Deere and Mansur was a company started in 1877 by Charles Deere, son of John Deere and Alvah Mansur that built agricultural planters for various crops such as corn, grains, potatoes and sugar beets. Although associated with the John Deere company it was kept separate in order for John Deere to focus on its specialty, plows. Although the company went on to make and sell other implements such as hay rakes and disc harrows, they were always best known for their planter line. In 1947 there was a name change to the John Deere Planter Works.