Harvey v Facey (1893)
The plaintiffs sent a telegram to the defendant, "Will you sell Bumper Hall Pen? Telegraph lowest cash price".
The defendants reply was "Lowest price £900".
The plaintiffs telegraphed "We agree to buy... for £900 asked by you".
It was held by the Privy Council that the defendants telegram was not an offer but simply an indication of the minimum price the defendants would want, if they decided to sell. The plaintiffs second telegram could not be an acceptance.
Read more at Law Teacher: http://www.lawteacher.net/cases/contract-law/agreement-cases.php#ixzz3suOzTNqJ