![]() For identification research, the critical date is the "Introduction Date", the date the watch model was first introduced to the public for sale. Measuring Movements Most wristwatches of the early and mid 20th century can be identified in the same manner as pocket watches (name on the dial and movement, and serial or model numbers). The key is knowing which decade the watch was produced in, and the Movement Table is useful for determining that. In this example, the 87 stands for the Certina 29-064 (Valjoux 728). ![]() Vintage watch movement identification Open a watch and look inside, you are looking at either a Japanese watch movement or a Swiss watch movement.
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