The Aeromarine EO was a light sport flying boat that was built in the mid-1920s.
Osborn was a former accountant for Aeromarine, assistant editor of Aviation magazine and future founder of Edo Aircraft Corporation.
The aluminum hull was scaled down from the Aeromarine AMC design, offering advantages in durability, weight and the inability to become waterlogged.
[2] The EO was an open-cockpit aluminum-hulled biplane seaplane with a single tractor engine center mounted in a nacelle on the top wing which also housed the fuel tank and oil tank.
The wings were constructed with spruce I-beam spars and ribs with aircraft fabric covering.