Originally Posted by
thumpism
. . . Originally sold by The Unicycle in Blacksburg VA the serial number looks like it has a misstrike.
First character looks like a bad 6 (Maybe a C?) followed by 690003. Hope this helps.
I have seen this format and location of serial number before on USA Nishiki bicycles.
The first and last characters on this frame were not struck cleanly. I would suggest that the serial number reads as: G6900030.
This is a Giant of Taiwan serial number from later in 1986. This is the time when Giant was changing the format of serial numbers stamped onto the frames. Giant was no longer stamping a date code separate from the serial number.
This format has only one letter: G for Giant the manufacturer.
The first number, "6", is for the year of frame manufacture: 1986.
As stated previously this is a 1987 model Nishiki.
It appears that this format of Giant serial number was only used for a few weeks.
Later in 1986, Giant added a second letter into the serial number and removed a digit from the end.