Note all the areas you are looking is on the outside areas. That is where you will find Machine Doubling. The DDO's will show a spread on the centers of the devices:
The top image is a normal example, the lower one is a doubled die. Note how wide the centers are on the devices. (reminds you of over inflated bicycle tubes)
Note this slight DDO example on date and part of Liberty. The central areas of the designs most often show the hub doubling in that location. Look for the spread of the devices. http://goccf.com/t/315550 More information on Spread.