hifi engine

AT-700 Audio Timer

Have come across my very own Audio Timer!... lucky me! Anyway, thought I'd try to fine out a bit more so I'm asking for some idea of it's uses please? I understand this is considered to be almost 'antique' but even in it's 'day', it must have been made for some reason.
It fires up & you can set the clock, etc, so I'm thinking, tho it's old, maybe I could find a use for it. Google seems to display sites' that show they are still used & also for sale, but I can't locate any manuals,(yet, will keep looking...).

Any help would be good...

Thanks muchly!