Does anyone have any idea what office this stamp was canceled at?

W. Bruce Graham in Ontario Broken Circles calls this type D1 (Enclosed Broken Circle) and lists on page 239 some 35 offices which used this cancel. However, none of them start with the letter A, as this one seems to.

My first thought was Acton, but the name seems to be about 9 characters long.
Any ideas?
Jan