Yes I agree with all of the above, wouldnt hurt to wipe it down with oil or soak it in high quality oil to stop the rust, some suggest spraying it with laquer but that seals the blade possibly causing damage should someone down the line decide to take it off. Depending on how deep the rust is sometimes markings can be brought up on blade near crossguard by rubbing with a penny but oil it first,,,will take the rust off and wont scratch steel. Let me know what your plans are with this blade as Im sure it would find a home should you decide to sell. Ive got a few civil war collectors Ill contact today and see what their estimates are based of course on condition.