Had a really old hammer and mallet bought many years ago from Bunnings. They were looking worn and tired and I wanted to see if I could restore them. The hammer had a lot of rust which I just clean off using a wire brush attached to my impact drill. Sanded the wooden handle surface with 80-grit and then 220-grit sandpaper. The face of the hammer was a bit harder as it was bent to one side, I had to use a grinder to reshape the face. Once that was done, the wooden handle was coated in marine varnish. It went well and hopefully I will get many more years of use.
My old hammerCleaned and sandedLooking good for another 10 yearsOld malletMallet handle clean and sandedAs good as new:-)