SB and dripped Hemi 106s. Identical (Covington style?) embossing and profiles on these two indicate that they came from the exact same mold - except for the crudely formed drips (some are sharp, some are rounded) which were added to the base plate of the original mold. Was the SB produced in Covington and the dripped version subsequently produced in Muncie with the re-worked Covington mold?