I agree with Dan.

You can hone the razor up and enjoy a great shave from that blade, but the ugly pitting can only be removed with days of slow patient sanding. Even then, the blade will remain scarred especially to your eyes.

Save your money and your time and buy another razor in good condition. It will be a cheaper way to go and more fulfilling.

I have a couple of razors that had similar problems to the one gifted to you. I have spent hours to make them presentable, but they are not something I would choose to use and so I don't feel inclined to sell them. I keep them to practice honing with.

Sorry to be negative.