Radio City Music Hall Concert Poster

[Shelby6t7]

I attended all 15 nights of the Radio City Music Hall shows back in 1980. I was fortunate enough to buy the show poster the first night, and later on had it framed.  As we all know the Dead ran into copyright issues with Radio City Music Hall over it, and they were forced to cease selling them. The poster used to hang on my wall for years but as time went on (wife/kids) it eventually came down and has been sitting in my closet ever since.
I am considering selling it to someone who will (and still) appreciates it.
I am just wondering what it is worth today some 28 years later?

Thanks (from a now "old time" Dead Head