Uncle,
Thanks for sharing your experiences, I'm finding this to be very interesting. The example models you have described really do illustrate well what John B. and Twinman have both said earlier.
Your 120" JU-52 at 30lbs has a total engine displacement of just 34cc. I wouldn't expect a single 34cc engine in the nose of your JU-52 would get the job done! Of course we're talking in general terms and not addressing wing areas and power loading etc.
Speaking of which, can you tell me what the wing area is on the JU-52?
To answer your question, the model is a Stinson Model U at 130" span.
Just for fun, here are a few more golden age multi's I like (they're not all beauty queens but still appeal to me for various reasons):

DeHavilland Dragon Rapide, Dragonfly, Comet
Kreutzer Air Coach
Stinson Model A
Miles Peregrine
Airspeed Ferry
Handley-Page HP-42
Boeing Model 80

Cheers, Nigel