Alright folks anyone clued up on 60s art work?

Friend just picked up a poster designed by Hapshash & The Colour Coat advertising Brian Epstein's Sunday At The Saville Theatre, Shaftsbury Avenue London, '27th August 1967' (the day Epstein died). It features gigs for The Jimmi Hendrix Experience, Eric Burden & The Animals and Georgie Fame. I think it's original from 1967 as it has been screen printed but it is very,very hard to tell if it is an original or maybe a very early reprint. It could be the difference between 100s of £'s & 1000s
Any info/valuation would be great
Here's A link with a photo of the poster in question.This isn't my friends one just found this image on the web.

http://www.whocollection.com/JimiSaville2.jpg

Karma+ is the prize for this one

Cheers, D.