The print (without what's on the back) is widely available:
http://shop.nationalt...t-by-arthur-pan/1014/
Prints which were signed by the artist are worth a bit more. (See item 44):
http://www.wscbooks.com/pdf/Cat_110.pdf
With vast quantities of that print being in circulation, I'd consider it extremely unlikely that the signature on the reverse is original but any decent local auction room, preferably one specialising in fine art sales, should be able to advise you.
Chris