I have one like this: frets in neck, not a plastic fingerboard. I must say, yours is in nicer shape. These are solid mahogany. 13" scale. They have a nice, kinda of "tubby" vintage sound. I have Worth Browns on mine, but have had a few other brands on it; Alohis sounded great, but they are kind of stiff on this ukulele. I have not tried Aquilas, but that's just b/c I don't really like them on mahogany sopranos.
Roy Smeck also endorsed/designed a few other ukuleles for Harmony including the Vita, which is a 14" scale, closer to a concert body ukulele, as well as the Roy Smeck Concert Uke, which is also slightly larger than a standard soprano. I know the Vita is spruce top. I believe the Concert is also. It interesting, in light of southcoastukes' quote that he endorsed quasi-concert instruments.