Still a keeper though! 40% silver!!! If you are having problems with distinguishing what is machine doubling, I recommend that you take something like this and put it in a 2X2. Mark it machine doubling and then when you come up on a coin that you are curious about, take a look at your example of machine doubling and it will help you out. I still have some issues with this but I have a whopper of one that i kept and it is a good learning tool.
When the devices on a die are doubled, those devices are of normal size and shape, with another copy appearing in another direction. All of the visible elements of that copy will be in that same direction or rotated in the same direction. If you think of doubling, as the name applies, as an add on, it should make the devices appear larger or of normal size with an added image in one direction to the side of that device. In machine doubling, the die bounces when I strikes the coin and in the process, shaves metal off of the devices making them smaller with a doubled image beside them. The doubling of the O, as well as the L's, in DOLLAR on your coin, very clearly show that the device was made smaller by shaving metal off the device after the initial strike.