The serial number appear s to be GL11122. I can't tell if there is another number after that but it's irrelevant. The 1st three characters indicate a fame manufactured by Giant of Taiwan during the 12th fortnight (i.e. weeks 23-24) of 1991. That's very early to be a 1992 model but the graphics are for the 1992 model year. I've seen other cases of carbon fibre frames being manufactured mid calendar year for the upcoming model year. I suspect bicycle inventory build-up took a lot longer with carbon fibre frames due to the time consuming tube manufacturing process.