A Serial Number is unique to each timepiece. Serial Numbers are extremely important because they prove that you own an authentic TAG Heuer Watch. It is located on the back of your watchIt.

• Find Seiko Watch By Serial Number

Determining the Date of a Bulova Watch For purposes of assigning a date, Bulova watches break down nicely into three basic groups: 1) pre-1926, 2) 1926 through 1949, and 3) 1950 and beyond. Those three date ranges are differentiated by the presence or absence of certain case and movement markings as well as the nature of any such markings, as explained below. In general, for all time periods, it is important to understand that Bulova watches never provide an obvious date of manufacture anywhere on the watch.

Find Seiko Watch By Serial Number

Rather, the date must be 'de-coded' using symbols, serial numbers, and two-character codes placed on various parts of the watch. These codes and the manner in which they should be interpreted is the subject of this article. Many observers of Bulova watches are confused by the sometimes seen patent dates stamped on the inside of some Bulova watch cases, and they misinterpret such dates as the time of manufacture. In point of fact, those patent dates apply only to certain aspects of the case design and indicate only when those general designs were patented. Those designs were used on many watches produced over a number of years, and the applicable patent date in no way indicates when any particular watch was produced. Below are images showing the two patent dates that often cause confusion.