* Change 3 Part Black {3794 Plate, Modified 1 x 2 with 1 Stud (Jumper) (Undetermined Type) to 3794a Plate, Modified 1 x 2 with 1 Stud without Groove (Jumper)}
Comments from Submitter:
All jumpers in the 20th century were the same, ungrooved type. Other versions are comparatively recent.