Metal Sign. Viet Nam Bell HU-1 Huey (Iroquois) “Riders on the Storm”. This vintage-looking metal sign measures 17.5" X 11.5". It is hand made in the USA using 24 gauge American steel and a process known as sublimation, where the image is baked into a powder coating for a durable and long lasting finish. It then undergoes a distressing process by hand to give it an aged look and feel.