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Hmm. Yeah.

On one hand, it looks like it's definitely been touched by a grinder or something. On the other, the oxidized spots in the long cut look to be the same age and character as the ones on...

On ones from that era, the blade slogans were usually a die-stamp, not an etch, and consequently deep enough to survive a really light surface grind.

That said, never discount the possibility that...