I can see pitting following the "0". This blade has had some significant corrosion and subsequent cleanings has actually smoothed and dished the edges of the pitting. I am seeing a combination of the pattern blade, staining and corrosion. That both blade sides have an 0 makes sense with this type of metal especially in the thinner areas as the design is 3D in the metal.
Try a 10x loop to get close up look. Blade corrosion that occurs when a blade is in a scabbard appears mottled and results in oval and wavy shapes due to water retention between scabbard and blade. It's difficult to imagine what a corroded blade looks like once cleaned, this one would have had the hard black rust as evident still in the recesses of the pits. This removes a substantial layer of the metal.
I suppose it's irrelevant now as to whether it had engraved letters or not.
I know one digital photo to the next can appear different too.
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