Unknown 1970's-era (Avant-Garde) printing 15&7/8 x 24&1/4" concert poster for the Grateful Dead appearing at the Anderson Theater in New York City on 11/23/1970.
 
 Designer unknown/not credited (most likely a HAMC member) medium-thin flat vellum stock poster is in  good to very good (B to B/B+) condition; there is a series of semi-pronounced thin horizontal roll bends traversing the image area, along with a set of pin/tack holes (all four corners), light toning, a few tiny surface scuffs/pin-prick spots scattered here and there and a couple of tiny edge nip tears, otherwise fine.

 Absolutely LEGENDARY late-1970 NYC Dead show! The actual date of the recording has been disputed (most likely Fillmore East 11/16), but here it is anyway;

https://archive.org/details/gd1970-11-23.sbd.lai.4734.sbeok.shnf