Diswirll is an exclusive mold to a small distributor called Midwest Gaming Supply. I think it is Omaha or Kansas City or somewhere close.
The Co was purchased a few years ago and the mold reserected after years of inactivity. Several Indian casinos have purchased them. I think I saw a cruise ship chip on the Diswirl.
Call them, I am sure they will tell you where they have sold chips.
I called them when I 1st saw an Indian Diswirl. The lady was very friendly.
Sorry I did not keep the number.
She might have old records, also.