Above, a 2-1/4 pound axe head I picked up on the weekend. I can't find any information on the manufacturer, either SAW or ASW.
Update: August 19, 2015:
Thanks to the visitor whose comment below identified this axe head for me. For a history of the S.A. Wetterling Co., go to their website. There, they have an interesting page on how they currently make their axes. They also provide the following comment:
The business is based on the following maxim: “You can not really own an antique axe forge – it belongs to our joint industrial history – but one can assume a responsibility. A responsibility to nurture and pass the knowledge previous generations have created, and that hopefully will outlive its keeper, on to the future.” What unites the company’s employees is an interest in axe manufacturing and axe culture. Axe manufacturing, a piece of Swedish industrial history, is still alive and spreading its products throughout the world.