It is correct, it is
Machine Doubling. But that trips up a lot of collectors for the longest time. On a doubled die, other than notches, you look at the centers of the design to find a doubled die. Look for the spread. If you looking on the outside edges of the devices you are setting your self up for a fall. Look for the devices to be enlarged.



Different forms of
Machine Doubling. (note how it always affects the outsides of the devices:

Side by sides with doubled dies:





Working identifying
Machine Doubling, that way you don't feel like you crash and burn all the time. This thread will help a bit more. Seeing what makes a doubled die and seeing
Machine Doubling is covered here.
http://goccf.com/t/283124