Especially useful, and challenging to sort out and verify, was the Shimano code. Don't know what the 6 means in front of it. Dec Normandy Hubs Normandy used a date code system similar to the one used by Maillard. This is on the front of the bike. That's the only one I remember off the top of my head.
These pages are through the efforts of the Specialized Technology Committee of the Allgemeiner Deutscher Fahrrad Club: It is in German, but years and model designations are effectively in English. There would be other facts to dispute some of the quoted matchups of year and serial numbers, but I don't want to sound like I'm trying to offend anybody. The latest letter code is also, with one exception, the largest letter group for the year, with margins of up to 5:1. After all, an ambiguous date is either January or one of the last three months of the year. I could site additional cases, but it would be superfluous. Comparable with most mid-range bikes you would find at a bike shop, if you can find one on sale at Dicks you are getting a great deal.
Now you could possible have an idea why I have been tearing my hair out! The assembly process is completed by our assembly provider in a separate appointment from the delivery appointment. Their work must not be stolen. Buy Online, Pick Up in Store: Available products are typically ready for pick up within two hours after placing your online order. The hoop installation provider will contact you one to two business days after your order has shipped. We have been told that when the company was sold the new owners only wanted complete boxed bikes and the rest of the stock of frames were destroyed.
One letter is the month, the other is the year. N0573129 N for the production line. A thought did come to mind as a result of this dialogue. Therefore, if the sequence begins with one of these: 109 101 102 103 119 111 112 113 129 121 122 123 we need something more to tell us what these mean. This can be as short as one digit, ie, 911 for Sept, 1981, frame number 1. An advance of several months is typical when dealing with off-shore manufacturers. The Team Mongoose, Team Minigoose and Supergoose, all should have a T in this area.
If I understand correctly, after removing the prefix and the welder's code you are left with a sequence of digits. Everything else should be very easy unless I am missing something again. The date code is stamped or cast? He believes that for many years in the 60s that more than one Letter designator may have been used. While I don't the necessary data for a definitive statement I have my suspicions. However, looking at the data for the G through K-codes show them spanning almost the entire model range regardless of model, frame size or frame style. The 1978-1983 Le Tour and Super Le Tour models had their serial numbers on the left rear axle hanger and many began with an 'S', followed by the Japan Made numbering system. Most early Treks 1976 through about 1980 were sold as framesets.
The assembly provider will contact you within 48 hours of your assembly purchase to discuss service. I really put some abuse on it for a solid few hours on the trail with jumps and large hills. Thank-you but just because something makes sense and is a nice fit does not make it correct. Some bike parts have a date code cast or stamped into the piece. I'll probably get to it over weekend and have a report ready sometime next week.
What I would add is that in my experience previous to say mid 1982 the serials didn't have a date in them, they were all over the place. The Normandy Luxe Competition hubs we have seen have no stamped information, but were marked with gold or red stickers on their barrels. Using this logic, Y9201937 might actually have been made in February of 1980, but was a part of the 1979 production run. T8040164 T for the production line. If you still can't find a serial number. New components often were used. There might also be a second letter digit specifying the factory that assembled the bike, if applicable.
At the end of the day I suppose it doesn't matter as there really is no difference between the 80-83 frames except for the early ones they made with smaller down tubes. I was thinking forever trying to think of frames that start with t o o l o but none came to mind. Maybe write it down on a business card and put it in your wallet too - just in case. I think you have now also narrowed the years to 1979 - 1983. Brought it home to give it a good inspection. The first pair of numbers is the numerical week of the year, 01 to 52.