Help I.Ding two 40+ year old ukes!

Hi all! So I've started seriously playing uke in the past two months with my dad's two - a baritone and a soprano. But it's been bugging me more and more that I know nothing about them - who made them, when and if they're anything special. Both have a made in japan sticker on the back top of the head. The baritone has no maker's marks at all that I can see. the soprano has a tag inside that says "Ariana Model no U-100" and "Made in Japan" again. Attached is some pics I hastily took, I can try and get better ones later. Any help would be hugely appreciated! Oh, I forgot, the baritone was purchased Christmas 1974, and the soprano sometime between 1977 and 1978. Thanks in advance!

Baritone pics

Soprano pics