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The rear derailleur freewheel/cassette and chainwheels are probably the first to be changed on a bike.
In this website, we credit the people involved in the understanding of these codes. (Naturally, for information provided by others, such as for the Campagnolo and Williams codes, the original source should be cited.)Ben writes: "Brakes and brake levers often have date codes on them.The two sets of Dia-Compe brake lever bodies I checked had the four-number date code stamped inside the lever body (I couldn't find any markings on the levers themselves).However, a Gran Compe set of calipers had no markings. For example, 1182 means the 11th week of the year 1982.Even those equipped with Suntour Superbe components usually had SR seatposts.Many components are marked with size descriptors in addition to component manufacturer's date codes.