Thanks to several readers who alerted me to some Ford GPA photos on eBay. After closer inspection (and a little studying) I learned this is not a SEEP and not built on the jeep chassis, but rather a vehicle called the Aqua Chetah built on a half-ton chassis and called a G552.

According to this Australian website, Roger W. Hofheins approached the US Military just prior to the US involvement in WWII about building an amphibious assault vehicle. Hofheins proceeded to create some designs and the Amphibian Car Corporation built them. According to Amphibiousvehicles.com, only four prototypes were built utilizing three different designs. As you can see in the photos below, its smooth front and cowl are quite a bit different than the GPAs.  Its side profile isn’t as refined either.

There’s a neat video of one being tested in 1942 in Holabird, MD: http://www.criticalpast.com/video/65675068957_aqua-cheetah_moves-in-water_moves-on-a-road_a-sea-jeep

The Amphibian Car Co. was based in Buffalo, New York. At the Buffalo & Erie County Library is an eight page book published by the company. According to World Cat, there are also some archive information, including a newspaper article from 1941. If anyone has some time, it might be interesting to see what’s there.

1) First Photo for sale. View all the information on eBay

2) Second photo for sale. View all the information on eBay

3) Third photo for sale. View all the information on eBay:

More links, photos and information:

1. Video: http://www.criticalpast.com/video/65675068957_aqua-cheetah_moves-in-water_moves-on-a-road_a-sea-jeep
2. Amphibious Vehicles Website: http://www.amphibiousvehicle.net/amphi/Ao_Az.html
3. The book Camp Edwards and Otis Air Force Base has some photos and information.
4. The G503 site has a picture of one prototype being moved that was originally posted at photobucket.
5. This site from the Netherlands has more information: http://forum.ktr.nl/index.php?topic=235.0
6. Rotorua Duck Tours: http://www.rotoruaducktours.co.nz/dukw-history