Coca Cola watch made by Swatch in the 80's It was planned to for Swatch to produce watches for the well known beverage Coca Cola Company. The deal was never concluded, as Swatch wanted the “Swatch” brand name on the dials but Coca Cola refused to share the dial surface for advertising Swatch as well.
Many different dial designs exist and even more combination of dials and corresponding cases.
Even ladies versions were planned.
Finally it was still the Swatch group who produced the watches for Coca Cola, even reusing the dials previously designed, but instead of mounting them inside Swatches they were mounted inside a lower quality plastic watch.
Many of these watches exist and most of them are working, since it was planned to produce them and many of the same combination of elements exist it can also be attributed to the prototype category.
If you don't know about the history of this watch don't buy it you can't find the logo Swatch anywhere just the ETA logo