I've been studying serial numbers for a long time, especially Asian built brands. I've collected literally thousands of data sets and compared them against my literature collection to decrypt the serial number formats. The forum has a number of Serial Number Database threads that I created to collect and identify serial numbers for brands such as Centurion, Fuji, Nishiki, etc. You may want to take a look at some of them to get an idea of the scope of my studies.

In your particular case, the presence of dual pivot Shimano 600 Ultegra brakes, if OEM, indicates no older than 1991. This is reasonable based on the presence of TIG welding, which started to appear on road bicycles, circa 1990. By this time, most manufacturers had moved production to Taiwan to lower costs. Taking this into consideration with the serial number points to 1995. This format with the F-code prefix has been seen on a number Taiwanese manufactured Centurion and Diamondback models and may represent Fairly, a known supplier of these brands.

Of course, the similarity to the Fairly serial number format could be coincidence, but based on the other evidence, this is the most likely candidate. Before you ask, it is probably not a Diamond Back. In 1990, the company owning Diamondback was bought by China Bicycle Company who moved production into their own factory. The Diamondback use a similar serial number format but with a U-prefix, probably representing CBC.