These are some pictures after the first evening on cleaning the blade. Again, I started with metal polish and then used some wet sandpaper with polish. However, I didn't use sand paper over the etching. The upper part of the etching seems to have faded a bit but perhaps it was always that way. I need another couple evenings to clean this up some more but I don't think I want to get it to a mirror finish. Retaining some of the evidence of its age I think will add to its character...at least in my eyes.
I am curious about the etching on the tang. It says Joseph Allen & Sons/Sheffield. But on the top row it appears to says "ON [dot] XLL". XLL is 90 in roman numerals but "ON" are not roman numerals. Still researching what this line means.
Shooter- thanks for the offer to take a look at my razor.

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