I'm with Rick - compared to the corroded surfaces, the stamping seems exceptionally crisp. This may suggest a later (though also apparently not recent) addition.
If it's done later, it's a pretty good attempt. It does look more like a VOO (rather than VOC) though! Since these stamps were never standardized, maybe the C was just missing from the tool set and they had to use the O twice...
Regards,
Kai
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