That is a very nice Bulova, and a great memento from your grandfather.
If you think your on will be wearing the watch, I recommend a service. It may run reasonably well, but whatever oils were in the watch have gone bad. Using the watch will cause premature wear. I know some shops will say wear it until it stops running, but I prefer to keep my watches properly maintained to prevent parts from wearing out.
To find out more about the watch, you can spend some time here:
https://mybulova.com/
Here are the date codes
@JwRosenthal was talking about:
https://mybulova.com/bulova-date-codes
Once you find the date, you can look at the advertisements from that date and figure out what model you have.
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