I agree this is not hub doubling, but circulation flattening. They way to tell is to look at the 44 in the date. On the class 6 doubled dies, not just the 9 is affected, but also the 4's. Here is an example:

Notice the normal date on the upper left. Not the straight upright lines on the 44? Then compare the other 44's in the other three images. Note that the stronger the hub doubling the uprights are more affected?