Definitely this one for me in terms of rarity. 1 of 2 across both SGC and PSA. The very hard to find W516-2-3 set (I saw someone post a Ruth earlier).
For those that care - the differences between the W516 variations are subtle but noticeable. The W516-2-3 version is the normal font and non-mirrored image.
If you've never learned the differences, Old Cardboard sums it up perfectly:
https://oldcardboard.com/w/w516/w516.asp?cardsetID=818