Hi again, here is the info in the 2009 SCD
NRMT $1600, EX $800, VG $480 size 2-5/8" by 3-5/8",
They dont know in what manner the Mantle was distributed. I have had a few YooHoo cards but not the Mantle. The Mantle card is of a slightly different design than the other 5 cards. The other 5 cards came with a tab at bottom, Mantle did not.
I read the info you found it looks like not much is really known about the card, not even the exact year.
The weather is nice right now, summer is nicest, but we get 180+" of rain a yr......... cool thing about this island is we can always drive to the rain or sun if we want, other side of island in Kohala gets less than 10" a yr..