Buffalo Nickel - Machine Doubling or what?

I recently ran into this 1934D Buffalo nickel - sorry about the big pic for those of you who dial up - but it's the only way I could get the image clear enough to discuss. If you'll note the area by the forehead and the scalp, you can see clearly that there's doubling. The doubling follow's the contour of the indian's profile all the way down to the neck - you can see the doubling there too, although you can't see the face doubling on here. Furthermore, the date, though not clearly visible on this picture, is also doubled - most notably on the 93 and 4 in the same Northeast direction. HOWEVER - the Liberty, shows no sign of doubling whatsoever. So the question is this - This coin is not in the Cherry Pickers guide, no note is made of doubling for this date anywhere - so the assumption is - aha! machine doubling. But if so, how is it that not all of the features are doubled, and secondly, if business strikes get only one blow of the die, where does the doubling come from?
Thanks!
Frank

I just noticed that the hairknot also shows doubling.
Thanks!
Frank

I just noticed that the hairknot also shows doubling.
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Comments
Glenn
I've seen worn die doubling, particularly in some Morgans, and that kind of doubling looks blurred, almost as if the edges of the devices have worn and can no longer "hold" the metal flowing into them. I can understand that. However, the doubling on this particular coin is crisp and defined, so I can't see that being the same - at least I don't understand the process.
Frank
Glenn
The underlying image of Machine or Strike Doubling has a "flat, shelf like" appearance to it. True doubled dies have rounded underlying images. Sometimes it can be hard to distinguish.
Try this:
1.Take a deck of cards and move the top ten or so cards slightly to the left. The "shelf" or underlying cards are representative of Strike Doubling.
2. Put your hands together, with fingers outstretched, and turn them so they're laying flat. Move the top hand slightly to the left, or right (which ever's easiest). The "rounded" edges of the underlying hand represent the doubling look of a doubled die.
Hope that helps.
<< <i> But if so, how is it that not all of the features are doubled, and secondly, if business strikes get only one blow of the die, where does the doubling come from? >>
This is definitely machine doubling. I've seen this on hundreds of Buffalo's. Most that I've seen have it on the profile and the date. The doubling comes from loose parts in the coining process.
Page 369 of Cherrypickers" The looseness allows the dies to shift slightly during the actual striking of the coin.
Glenn