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+1 on what Marty said. Specially this!

The info you posted is what i use. Its a great way to figure out the age. Unfortunately not all razor makers went this much into detail on there stamps. Some never changed besides adding the country....

The Tree chart is best when it comes to dating these. Thanks to Tom for linking it. Id say polish and steelwool is worth a try. It might mame it a little better. But as you said, itz not in too bad...