Hults Bruk – 1 kg Yankee Pattern – Pre 1988

I recently inherited a garage full of stuff from my Father-in-Law.  A rust-covered axe, in the beginning, was salvaged by soaking in vinegar overnight and giving it some polishing time on the bench grinder wheel brush.  After cleaning off the rust I discovered an HB logo on the left face and 1,0 – 2 1/4 on the right face.  Oiled it up and it’s a beauty.  Is this a Yankee Pattern and what year? It has a 28-inch handle.