It does appear to be a Harmony, the first 4 digits would be the '"batch" number 1614, last 4 digits would be the model number.... H620....though I haven't been able to find that model number listed anywhere.
The S-44 would be the spring of 1944.
The only Harmony models H620 I could find are amplifiers.
Harmony is still in business, maybe you could contact them to see if they have more info.
Established in 1892, Harmony is the world's most cherished musical instrument company. Our guitars are thoughtfully crafted for the modern musician.
www.harmony.co