Why would anyone want to make a spring like this instead of using the traditional method of forging one spring? Doesn't proper forging leave the grain structure running longitudinally with the leaf? Perhaps the answer is the lack of skilled spring makers.
Why forge one spring at a time, when you can bend one large piece of stock and cut three blanks from it? That way you will have a spare when one of the two springs you need to make happens to break during shaping/heat treating..etc. Seems to me the worker making these springs is very skilled/experienced in doing this work.
The steel is cheap, but the time it would take to prepare a single spare blank down the road, is very expensive.