I've never heard about Gibson selling baritone ukulele kits, and it would not fit into the company strategy of that periode at all. Baritones were quite new then, they only offered them for a rather short while, and they had a very strict policy with vendors about orders and taking back unsold stock. In those days, they were aiming for the higher end of the market, and used other brands for lower end, 'entry level' products.
Having said that, the baritones are among the most varied of the Gibson ukuleles. I've seen them with a wide variety of headstocks, fretmarking dots, saddles... That's probably what caused your question, a seemingly patched-together Gibson baritone uke?