This is an extremely rare axe head.
Production 1917 to 1930, by Gränsfors, while the stamp was held by Sheffield. 
In almost perfect condition and reground by me on a Tormek Swedish stone thi 1.2kg/2.7lbs Swedish Carpenters Axe Head by Gränsfors Bruks {Record model} would make a lifetime historical tool or add to a collection.
Blade Length is 12cm.