How do I remove the back of my Caravelle by Bulova 43B29 watch? I need to change the dead battery.

There is a special gear type tool with prongs on it that rotate the back of the watch off (turn to left to take off, right to replace). If you don't have one, take the watch in to a jeweler's and they will replace the battery for little or nothing, usually.
Good luck, and hope this helps.

I believe on this watch you will have to take it to a professional that has the right tool to remove the back. I have had some luck with places like radio shack or other stores that sell watches and batteries. Sorry I'm not more help but I've tried everything I could think of and just dinged up the back of my watch. Thank you.