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Made in Taiwan.
Fourth Letter in the serial indicates year of production (1999 or 2000). X in the example above indicates production Month (E to L - May to Dec). Y in the example above indicates production Month (A to D - Jan to April).
Bikes made in Taiwan usually had an 5-8 month production and shipping timeline before they were sold in bike shops around the world. Bikes welded in the later months of the year would normally be made for the following year.