Thank you both for that...and thanks to Topps for putting "Refractor" on the card somewhere. I really don't see much of a "rainbow" type difference, but it could be the bad lighting in my basement (or my 53 year old eyes).
I also wasn't helped by using the #4 Mickey Mantle card as my reference in the database photos. Looked back and forth and back and forth and really didn't see a difference. Turns out the base set image for that card is actually a refractor. To be fair, I used card #2, also (forget who, but whomever he is he ain't Mantle). That one was the correct image in each set, but in the front side images I can't really spot the difference. Scanning, I figure. So again, I'm glad that Topps took the time to note it on the back.
I'll add that comment to the set for future reference.