CCTV has been released after a woman was sexually in the Purple Turtle earlier in the summer.
Police say the man may hold vital information after the victim, who is in her 20s, was touched over her clothing in the Gun Street bar.
The attacked happened between 2.30am and 2.45am on Sunday June 26.
Anyone with information about the incident, or who recognises the man, should ask for PC George Wigley at Reading Police station on 101.
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