My parent's infinitely practical sleeper sofa.

I inherited this from my parents, and have found it very useful over the years. Face it, sleeper sofas are notoriously ugly but I think this one is actually nice looking. The upholstery is wool, and it is very well made. I believe it was purchased in the late 60s or early 70s, but I can't find any markings on it. Would love to know who made this. Any help appreciated.