Yes on the Peltier Peerless patch, it is a bigger one and it just takes some experience to spot these, all seams aside. Some have little coverage and some have great coverage---yours is a great size--- and just a great looking marble for a patch--just great!
Some but not all Akro Corkscrews fluoresce under UV light with a variety of colors. Yours is an Akro cork—no doubt in my mind. Corkscrews will also show up with opalescence.
That is why I always backlight them all and hit them with UV.
Marble—On!!