what happened was a nasty looking old blank was turned into a gorgeous knife....just guessing, there.
As for the stamp, if manually stamped, which I suspect, yeah, it just bounced, with the hammer. If a machine press, it shifted and nobody caught it. I have no idea how Harry's son was doing things before AG bought him out, nor if blade predates the son trying unsuccessfully to keep the shop going.
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Cadent a latere tuo mille, et decem millia a dextris tuis;
ad te autem non appropinquabit.