A friend of mine collects Kirsten pipes, they were more common than Falcons in western Canada from what I can tell.
The Worlds Coolest Smoke Since 1936
www.kirstenpipe.com
I have a Kirsten from the early 1950's. I asked the company if there was a way to date it and was told mine is a "transition pipe" made sometime between 1950 and 1956. With the bowls I have, it is a decent smoker when I know I only have about 30 minutes.
I research Dr. Frederick Kirsten who invented and patented the Kirsten Pipes among other, more important inventions. He is credited with inventing the first working wind tunnel at the University of Washington in 1936 and the cycloidal propeller.
One of the interesting debates I've seen is which came first, the Kirsten or the Falcon. It seems they were both patented in 1936. The Falcon had a very limited production until 1949 when George Hunt took over production and marketing.
I think, the reason Falcon is better known and more widely produced was because the Kirsten pipe wasn't a focal point for Dr. Kirsten. New Kirsten pipes are still being produced but they have a very small footprint in the pipe world.
Being produced in Seattle, I'm not surprised that they were more common in western Canada.