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Mystery Metal Stamp ? Welders?

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  • Mystery Metal Stamp ? Welders?

    I inherited a bunch of my grandfathers tools about 15 years ago.
    He was a welder, shipbuilder, submarine welder during WWII.
    He was a master at welding anything, and he used to make some his own welding gasses.

    I found a metal stamp that has had me puzzled ever since. It is the type to mark metal, such as gas cylinders.

    The stamp shows a large "R" with a smaller "N""2" in the top half enclosed portion of the "R" and a "S15" in the lower half between the two legs of the "R".

    I can't figure out if it is a gas compound or what?

    Last edited by YankeeMetallic; 12-12-2014, 10:12 PM. Reason: Added image
    Duke Reno / Yankee Metallic Metalcraft

  • #2
    N superscript 2 is nitrogen N2, I have no idea what the S one is, have seen special gasses with S on like Argon 5% methane ,stuff like that
    Mark

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    • #3
      Added an image of the stamp
      Duke Reno / Yankee Metallic Metalcraft

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      • #4
        Nothing that I can imagine, it may be a "makers" mark.

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        • #5
          I do remember something from the fuel lab in work, fuel oil s15 was a low sulphur diesel oil, probably nothing but?
          Mark

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