I first became aware of the wobbled or scrambled (which I think was the more popular term then) seam when the West Indies visited England in 2000. Fast bowling great and one-time record-holder for wickets in Test cricket, Courtney Walsh, was spectacularly successful on that tour, capturing 34 wickets in the five games at a staggering average of 12.82 and at a strike rate of 38.88.
His methods, as always, were simple ones. His pace had eased by then, but he was still as precise as ever in length and direction and elicited a fair bit of sideways movement on green-tinged surfaces. He didn’t swing the ball much. In fact, I recall him exhibiting some frustration at two deliveries in one over that swung waywardly down leg. He did his work off the pitch.
https://garfieldrobinson1.substack.com/p/the-mistake-that-became-a-method