Dating campagnolo hubs updating component registration error
This clearly is when the component was made and not when the bike was made, but unless the component or bike manufacturer had lots of stock lying around in inventory, the date should be a fairly good indication of the year of the bike.
At least it would be the earliest date that the bike could have been made.
SR stems usually are marked with the same date code. An exception is the SR Royal stem, most - or all of which, have no code. ) SR handlebars have the date code stamped near one of the ends of the bar.
Dia-Compe and Weinmann Thanks to Ben Weiner for sending the following information about Dia-Compe and Weinmann brakes.
Unfortunately, many of these are coded, and require some additional knowledge to understand the code.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.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.