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Made in Taiwan.
First two numbers in the serial indicates year of production. 1998 or 1999. Y in the example above indicates production month
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.
For more detail on what the serial number means on your mid school GT BMX, check out our easy-to-follow serial number guide.