Wills was a British cigarette company that apparently decided to use its packs for semi-educational fun. The description on the back, below, is reasonably accurate, putting economics as the prime mover behind the development of steel-frame technology.
I have no idea whether the average Wills smoker would have recognized the picture on the front. It shows the simultaneous construction of the Singer Tower (the thin red spire) and the City Investing Building (the broader yellow building behind Singer). I couldn’t quite find the photograph that was used as the basis for the art, but here are some similar views: