I have just received one of these today :D
http://www.ledwatches.net/photo-pages/bulova3.htm
Gold plate of course! However I took it to the jewellers to have the band resized for my slim wrist and we got chatting about the watch. I asked him about removing the back for battery replacement for future reference, suggesting that a special wrench of some sort must be used.
He replied
"No, no, I just use pliers"
Now there is no way I am letting any plumbing tools get near my watch so can anyone let me know if there is a wrench a la pulsars but for bulovas or is it just an ordinary watch removing wrench 'cos I'll do it myself!