Over on Arkitip, blogger par excellence (and Colette co-founder) Sarah Lerfel just posted a rare photo of a vintage Keith Haring tag. It comes from Martha Cooper's new book, Tag Town, which documents the history of NYC graffiti art from the sixties to the present. You'll also find shots of other hard-to-find pieces by the usual suspects—including Basquiat, Kenny Scharf, and more. Check out some more preview images here.

And in other tagging-related news, attention Banksy shoppers: The artist has recently established a panel that gives his permission for selling his graffiti. So before you drop a couple mil on a concrete slab with two bobbies kissing, make sure it's been approved by "Pest Control." The idea has been pretty effective so far: At one recent sale, an unauthorized piece was withdrawn before the auction even started.