This is what we call a Novelty Watch, we really love kooky watches and this one of those !
Oba isn't the full name of the brand of this Watch only the three last visible letters of the logo that we can see under a loupe.
This is an homage to the Ernest Borel Kaleidoscope Cocktail Watch but without the Kaleidoscope ! It's a semi-skeletonised wrist watch with a visible movement.
The Watch is in good condition, the case is yellow gold plated bezel with Perspex front and back. It's in good condition with some plate loss visible and some superficial scratches. The dial is in good condition with little signs of ageing.
Inside the case is a Swiss made 15 Jewel lever movement which is unsigned.
Cosmetically overall this is in good condition and running well.