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yes, if the razor is still able to shave, though not as it used to.
if the razor cannot shave then no, 12k grit stone is not going to help you.

i can tell you what hones i usually use to sharpen...

If it has chips and oxidation you redo the bevel. If it's just a little dull you sharpen it. I've never had something in between.
If those who have honed it before me were any good it may be just a...