I checked the proportions of other hilts of similar swords in Oakeshott's books and other photos and many have similar or in some cases even smaller grips. These are definitely not "boy's swords". My sword is dated around 1250. I know generally people were shorter (hence with smaller hands) in the past than in the present, although the Celts and Vikings have a reputation of being larger (I read one study of a Celt skeleton being 6'4"). But does anyone know how large your average 13th century knight really was?
I also noticed that many of these "short hilt" swords tend to have a relatively large (circular) pommel. Could there be some advantage in a short grip when holding such a sword? For reference I am enclosing a full scale pic of my sword...

