I put the 'Question' to a high ranking acolyte of the SWCA. After consuming a full bottle of my best brown liquid, the worthy told me this.
" I will not confirm or deny that such a marking was ever placed on a S&W product or that it has any special meaning."
The next morning I was questioned by Homeland Security for 4 hours, and told I was now on the 'WATCH' list.

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Field Researcher. IGC