The two different D239 wrenches from the Virgil Saak Auction Lot 825 are shown below. The bottom one is the
wrench shown in Rock Island Parts Books. The top one is the one shown in Rathbone Volume Three as A Kingman Plow Co. wrench but I have not seen a parts list example yet. Volume Three had not been published when I wrote up the Saak auction.
(http://i222.photobucket.com/albums/dd3/buswrench/saak-2011/VS-820-828.jpg)