Hults Bruk – Yankee Pattern – Pre 1988

This axe belonged to my Father, who had it since at least as long ago as 1980, possibly much earlier. He most likely purchased it in Victoria, Australia.
I am currently doing some restorative work on it, and have a new handle on the way.
As the photos indicate, one side has the HB -Made in Sweden logo, the other side has the weight:
2,0 (kg)
4 1/2 ( lb)
Length is 188mm at widest
Depth is 138mm at deepest

Thanks for any help in estimating the age,