Can't find my antique radio guide
BUT.....if memory serves me correctly, the 97T dates from around 1938....actually a pretty nice performer. I think that's the model I did a restoration on about 4 years ago for a fellow. I may be way off on this, but if I remember this set, it has a T-shaped dial and has about 8 tubes (console). Even if that's not the exact set, the series number still puts it at late 1930s....I really gotta find that book!