those are all the type called Japanese Transitionals. They can be found up to a little over an inch. As for the feathery one being hand gathered I would definitely need it in hand to even make a guess. Most anything is possible with marbles but I just do not think the feathery pattern was something done when handgathering. Getting the glass to stay layered in those extremely fine layers after a gather or two would have been extemely difficult IMO(if even possible)