Detlef, I suggest that you take this blade into very good light, and closely examine the apparent patches under magnification.
That would be where I would start.
On the side of the blade opposite to the apparent patch, I am assuming that there will be one of the pools of pamor which form the pamor motif. If this is so, the indentation that caused that pool of pamor may have been taken a bit too deep during the manufacture process, and with time the iron covering has eroded and exposed nickel from the other side of the blade.
Yes, the colour of the apparent patch seems to be brighter than the other contrasting material, but it seems to me that at least one layer of the contrasting material is also a brighter colour, it looks like there are flecks of brighter colour contrasting material along the blade.
To do a weld of the technical difficulty required to place a small nickel patch onto an already very worn blade would be very, very difficult, most especially with the forge technology available in Jawa, either in previous times, or now.
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