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Not goin to say this is PC, but I would figure this would have been a 19th cent more (1820's on) thing, not a 18th cent here again this is my opinion :m2c:
I think it's probably a 1950s Hacker Martin thing.
What you gentlemen don't understand is, I don't care. I would rather not turn this thread into a discussion of the period correctness of the procedure, but rather the methods involved in doing it regardless of who/when/where it was done in the past.
Couldn't you wrap the rod with heavy gauge wire and then run current through it, heating the wire and burning in the stripe?
Nifty idea... I'm leaning more towards wider dark stripes though. I'm thinking about 3/4" wide on the dark side, maybe 1/4" to 1/2" on the light side?