Beras wutah is the natural result of forging out, bending, and welding:- the typical random pattern.
As to when manipulated patterns for artistic purposes began to appear, sorry, I cannot support a hypothesis---or more correctly, I cannot support a reasonable speculation as long as I'm wearing my western analytical hat, if I care to put my Jawa hat on, I can give all sorts of very good arguments for around about mid Majapahit---but I'm not going to go there.
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