Trying to find info on late grandfather's baritone ukulele

Hello! I'm trying to gather any any info on this baritone ukulele.

I've had it for years, it was my late grandfathers. My grandmother said it was from when he was stationed in Hawaii during the Vietnam war and bought it to play with friends. I have tried looking inside the body with a flashlight but other than the name "Omni" on the head, there is literally no other markings on it to help identify. And I've looked online but no luck so far. Any resources or insight would he greatly appreciated.