Seversky SEV-3 Amphibian 

First flying in 1933, the Seversky SEV-3 was a three-seat monoplane amphibian. It could either be fitted with twin amphibious floats which had main wheels fitted in the floats to allow it to operate from land, or with a fixed tailwheel undercarriage with the mainwheels enclosed in large fairings.

The landplane version was developed into a trainer for the United States Army Air Corps and designated BT-8. A total of 30 were ordered, but they proved to be underpowered and were replaced by the North American BT-9.

The Colombian Air Force ordered six SEV-3M-WW amphibians. Only four were actually delivered. Photos of the Colombian aircraft can be found here.

Seversky designed an improved version, the SEV-X-BT a multi-discipline trainer version of the BT-8 with retractable undercarriage. The sole SEV-X-BT lost in competition to the North American BT-9 and was reportedly scrapped for spares to service the Seversky 2PA.