Hi Chuck
The sunsets that I have, 40 or so the ribbons vary from a complete four vain cat's Eye to all the color being on the surface, almost a brushed look. All are loaded with bubbles, some only big bubbles and some the bubbles are so tiny it makes the glass appear cloudy.
Many have a lot of degraded furnace clay / fired brick pieces in them.
Some have Cresent shaped cut lines but not always where you would expect a cut line.