Do some research, I'm thinking they've got to be worth a fair chunk of change!
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On Fri, 11/29/13, Alistair Bell <albell@SHAW.CA> wrote:

 Subject: still uncovering things in workshop
 To: vanagon@GERRY.VANAGON.COM
 Date: Friday, November 29, 2013, 1:53 PM
 
 more forgotten stuff. This time, of
 all things, about 16 Polish theatre and opera posters from
 the ’70’s.
 
 http://shufti.wordpress.com/2013/11/29/more-finds-during-my-hunt/
 
 
 I know I have the mother (or should that be father?) of all
 posters still to uncover.
 
 alistair