It’s quite common to see ukes like this vintage Hawaiian ukulele being referred to as, “TABU ukuleles.” Which is understandable given that it’s often the only mark on the ukulele. But it’s actually a trade-mark for ukuleles made for ukuleles in Hawaii. It was instituted (according to The ‘Ukulele: A History) in 1916 after the Hawaiian makers got pissed that mainlanders were making shoddy ukes, giving them a Hawaiian name and passing them off as the real deal. Thank God that doesn’t go on anymore.
For all the people that have asked me if it’s okay to put steel strings on a uke, here’s one you can: Kamoa steel string electric.