It is indeed a Stefan Ronnqvist axe and they are, sometimes, available from Woodland Craft Supplies in the UK. Apparently expensive and expect to carve your own handle . I guess we'd all like one and Stefan can only make so many, presumably by hand. Perhaps somebody at Gransfor Buks (or Whettling or Hansfor Buks...or Spear and Jackson or some entrepreneur in Sheffield) should do a deal with Stefan and/or Jogge - or come up with their own variant e.g. a lighter (~1.6lb/700g?), more radically bearded & upswept version of their classic Swedish Carving axe/a traditional/historical viking Skeggox. Or perhaps Stefan will take on apprentices? Get the price right and we'll be queuing up for them .
I'm ready to join that queue right away!