Welcome to the forum cherry.
Cheers!
PCGS is doing all the grading for stacks bowers.
So to get a cas coin graded by PCGS, you must auction it off through stacks bowers?
No, you may submit coins directly to PCGS. You need to sign up for a membership on their website, complete an online form, print out the completed forms, mail the coin(s) to them... and, voila!
https://www.pcgs.com/