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For vintage razors my general practice is to assume the old edge is oxidized. I use a 30X scope and if the steel is weak it will usually show itself at the 8000 grit level.

Hope this helps,:)

My first guess was that the edge is overhoned, but, if that was the case then it would not have shaved well from the beginning. That narrows it down to an oxidized, rusted, weak edge. It sounds like...