Just as the crossguard shows darker (more radiolucent) areas of less density suggesting old weld or fold lines from the forging process, the pommel also likely has such areas within its mass that appear as these darker spots in this view, but might look more like imperfect welds if the pommel were rotated 90 degrees.
Also, the blade appears to show more corrosive loss than the hilt elements or tang. This may reflect a different composition of material and perhaps protection for a while longer by a covering guard and is not unusual in my experience.
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