June 1949 is when the first 100,000 copies were sold in the US, 1948 for the UK by a different publisher. Typically if it is a subsequent printing it will list the years or months it was reprinted. If that is an authentic 1st edition of Nineteen Eighty Four then it is very valuable and worthy of the banner. Link to the history. I love books.
Depends on condition etc. Originally had a dust jacket. Is it stamped with library marks or other such stuff. A quick search from about $30.00 to $300.00. Not bad for .35.