the Casablanca?s movement has ceased to work which is very disappointing. This watch has not be submerged in any water or been in any unusual conditions, hot or cold. I would ideally like to exchange it for another model as I do not trust the Casablanca. Can you let me know if it is possible to exchange it for the Jumbo : Black Strap, Silver-Coloured Case and numbers and White Face which from various blogs I have read appears to be a trustworthy and robust model of yours.