The Boeing B-1 Model 6 was a "pusher-style" flying boat, with its engine at the rear. It could carry a pilot and two passengers, as well as mail or cargo.

The Boeing B-1 Model 6 hull was laminated wood veneer, and the wing frames were spruce and plywood.

The lone Boeing B-1 Model 6 outlasted six engines in eight years of international airmail runs between Seattle, Washington, and Victoria, British Columbia. Flown by Eddie Hubbard, the B-1 covered 350,000 miles, remarkable for the time.

The Boeing B-1 Model 6 flying boat had a top speed of 90 mph and a range of 400 miles.
The Boeing B-1 Model 6 was designed by Claire Egtvedt shortly after World War I. The B-1 designation indicated the first commercial design for Boeing.