GGU: It's almost dusty, like maybe it was rubbing against the shelf. I'll see what happens when I season it next week. Her store is mostly antique and "fine experienced" teaware. About 75% teapots. Mostly english pots and cup sets. Tea was crap, she said she blended everything herself and all the herbs and flavorings were organically home grown. However, it smells just like the raspberry tea you buy in the grocery store.
She had 6 other yixing, but the really cool ones were green painted, I think. Painted INSIDE. Because the bottom of the lid and the bottom of the pot had paint rubbing off and the natural clay color was showing through.
One was shaped like a dragon (a very squat dragon) with so many crevices it wasn't practical for use.
This one looks big, but it's probably 6 oz., serve 2 gong fu. It was unique, to say the least, and not green.
It's a tiny downtown store tucked in a hotel. Low ceilings, no A/C, HOT, and she is playing CDs of the Mormon Tabernacle Choir or something (I'm more of a Stelllar Kart or Atomic Opera fan)
Anyway, after getting it home and looking at it better, it has a black-ish cast around the lid and bottom where the lid rubs against the pot and where the pot rubs against the counter. Anyone know what this is (I am hoping NOT lead! 
)
It looks like an optical illusion.
