I wouldn't blame your former friend for the condition of your gun. It appears that there was corrosion/rust in that area of the receiver that was removed prior to your purchase and cold blue was applied over that spot. Applying oil to cold blue will some times remove it in the manner as your pistol now appears. If your pistol had original finish in that area, oil would not remove it. This is my opinion based on the pictures and the assumption that you did nothing to the pistol.
If that is the only area that is suffering, reblueing will not affect the markings.
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