That's my point; I've seen most sumbawa with nickel pamors, and of course the besi baja in the middle. I've seen sumbawa with meteorite pamor too, or claimed to be of meteorite pamor. Since there is vivid differences between nickel pamor and meteorite pamor, so I take it as it is told
This blade pamor works are unlike any sumbawa pieces i've ever seen. Obviously no pamor gunungan / junjung darjat at the sorsoran, and I dunno but it doesn't looks like nickel too.