HiCustomer my name is XXXXX XXXXX I have an answer for you.
The Landau Motor Home was manufactured by RV Industries in Anaheim California. The Landau was first introduced in 1969 and continued to be manufactured until 1987 when RV Industries closed its doors.
In 1999 Georgie Boy RV in Michigan introduced a model bearing the Landau name, but the two companies had no relationship with one another at any time.
I hope this helps you with the information you're gathering.
Thank you for the opportunity to assist.
I don't have a picture of the 1979 models, but it wasn't much different that the two pictures I have.