Ray,
Not an expert on modules but just be patient on the responses. I have noticed that this forum goes in spurts.
The module you have will take silver oxide 357 batteries, it is not the same as the driver modules as they have the slanted led display and come in 6 and 4 digit models.
MOVEMENT:
Yours has a basic module: hour, minute, second, date and month in numeric and maybe day. Other than the ability to MAYBE repair missing led segments with silver epoxy and the swapping out the quartz crystal these modules are extremely problematic to repair. If your works and you keep it dry, corrosion free and swap out the batteries about every year depending on your usage it should last for quite awhile.
CASE
A photo would help but the Bulova gold plated and base metal cases did not last long due to the type and thickness of plating. The stainless steel cases are more durable and desirable depending on the module. Cases can be replated provided the buttons are removed and then reinserted. Stainless cases are easy to resurface. If the crystal is mineral or glass it can be removed with a hot hair dryer or with the oven treatment (module removed!!!!!!!!). If plastic then there are many polishing compounds out there for plastic crystals. Search this site as there are many articles on case refininishing.
See this posting to see what can be involved in repair and restoration:
http://dwf.nu/viewtopic.php?t=2253
Hope this helps and I know others with more specific knowledge will fill in the blanks:
before and after:
after pictures of a replated Bulova driver case: