Grateful Dead poster 1971 Hell's Angels Anderson Theater NYC pristine condition

This poster is owned by us since 1971, 35 by 23 inch very rare well sought after collectible Grateful Dead poster, for a concert that was made in partnership with the Hell's Angels and held in the Anderson Theater. Rare, well-known and highly regarded by Dead fans throughout the world. This is an excellent opportunity for the serious Grateful Dead aficionado. This poster has seen very little daylight, measurable in hours, over the just over half century that we own it.