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Clean with fine 0000 steel wool and metal polish, then polish with the finest wet and dry paper you can find, at least 2k or lapping film is better.

You can darken the etch with vinegar, or gun...

Very little spine wear, should clean up with just some oil, steel wool and good metal polish.

Yup, will need a good honing, should be a couple of shavers. I do like thin old razors, I have several...