Interesting that this talismanic number was still engraved on blades as late as in 1720. It was profusely marked in Passau blades as early as in the 16th century, if not before. Quoting some source, this magic number was composed with multiples and combinations of the number 7, in a mode to plea for divine help (quote) in all directions, when unsheathing the sword. But most probably the source mentioned by canos has a different interpretation, which we would like to know of.
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