Machine Doubling is found on the edges of devices. You need to look on the centers of devices to find a doubled die. Note how the devices look in the center of the devices? They are widened because the design was doubled on the die. Machine Doubling is not enlarged. It actually reduces a normal device. Sometimes you have MD and Die Deterioration. Note the colored arrows, showing how to tell which is which. The best way to find a doubled die is to become familiar with how they look: http://goccf.com/t/257616 Checkout this thread. It will help you to see where to look for doubled dies on Jefferson nickels.
Not sure if you are asking us, but Machine Doubling is common and does not add to the numismatic value of this coin. You can safely spend it rather than wasting your money by sending it in for slabbing.
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