Most, if not all, of those fine tugs you see around the world were designed by an American, Robert Allen. His tugs were a quantum improvement over the generation of tugs before them. I’ve seen Allen tugs in Canada, Ireland, UK, and Italy. For a pilot. seeing one of those tugs come your way for a job was as good as it got.
EDIT: Turns out Robert Allen is Canadian. My sincere apologies to my northern neighbors. (I like to think we are all “Americans” on his side of the pond.)