I have found that with Katars they often would leave the wootz pattern in the fullering but the edges were often polished bright. In your example, I would not be surprised if the steel within the fullering turned out to be wootz and then the edges were polished bright. Since the deep fullers are a hard area to clean when the Katar receives a cleaning or polishing, I can see the wootz over a long period of time "fading" away.
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