Found this two days ago during a hunt and just getting around to posting. I think this is actually a quite major variety, which has gone under-appreciated (Wexler doesn't even list it as a "Best Of") because there are no raised letters on the coin's reverse. Significant extra thickness shows on virtually all of the devices, but is most prominent on the firework sprays, the windows and arch of the building, and the stripes of the flag. I've taken a few side-by-side shots along with a normal version of the coin to help compare the difference.
DDR:

Normal:
DDR:

Normal:
DDR:

Normal:
