Answer:
Harmony made some the of finest Ukes since the 1920s. Purchase price at the time was reasonable. Since, however, many of these, especially those built in the 1940s and 50s are very collectible.
The vintage Ukuleles often have some really good tones. The wood has had decades to 'relax' allowing them to really reverberate. I have two that are over 40 years old and they make some big sound!