How many movies have Al McKinnon and Billy Armstrong acted in together?

They have worked on 2 movies together! Their first movie together was Sheriff Nell's Tussle (1918) while their highest rated movie together was Yankee Doodle in Berlin (1919). They have not worked together since Yankee Doodle in Berlin (1919).

Role
Black Pete - Who Needs Watching
Role
Silk Hat Cecil aka Jersey City Joe (as William Armstrong)