Depending on the purpose for looking up the Bulova serial number, several online resources are available as of 2015, including a full database at MyBulova.com, a date list at The WatchGuy.com and a full timeline at Watchophilia.com. Very early Bulova watches do not have serial numbers, however.
Prior to 1951, a consistent serial number system was not used by Bulova. After this date, the letter and first number at the beginning of the serial number indicate the year of production. The rest of the serial number is random, but the database at MyBulova.com can use this information to identify the watch when combined with more information about the movement type, model or date code.