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Hand sand with some 1k wet & dry then watch it to see if it develops fine red rust. If so remove the scales quickly to save the blade.

Whenever I see a blade where the marks have been buffed off,...

Might be, have seen the double vertical mark on Genco tangs.

More importantly was it rusted when you got it? The rust pattern looks like a Cell Rot pattern. Might be why someone buffed all the...