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“I found this while thinning out my razors and can't seem to find any info to see if it warrants keeping or not.”

I was answering this part of the OP

oh, and if I found that in my collection, I would definitely keep it.

It says "pour barbes très dures" (with an R, not a D). The literal translation is "for very hard beards", but maybe a better translation would be "for very thick (or stiff) beards."