yup I know this brand, I have a few ukuleles, when I sold them people mistake them for mele brand.
the whole ukulele is made of koa including the neck , fretboard, bridge body and even the inner kerf linings from what I have but yours seems to have a rosewood or ebony.
super rare to find as it is kinda old. they all have that round neck headstock and same bridge pattern. also the body is tapered and so far only found them in sopranos only . maybe theres bigger sizes out there. mystery