Hello I think the car on this photo could be the same car or at least the same model. Its name is RGS Atalanta coupe, the source says this is from 1957.
Yes, that looks like the same car.
Although they could be adapted to use many different chassis, varying in wheelbase from 6'3" to 11'6", the cars could also use an RGS ladder frame designed by John Griffith.
The company had grown out of the original Atalanta but finally ceased production in 1962.