Look on the back of the watch case. There may be a letter and number designation, like L5.
Bulova only started dating their watches in 1949. 1949 was designated A9. From 1950 on they used the following designations. The letter stands for the decade and then the year number.
L=50, so L4 is 1954
Before then, you cannot really get an accurate date, but just have to go on the general style.
I hope this helps