Originally Posted by T-Mar

The two serial numbers suggest the bicycle was manufactured in two different facilities. This is not unknown the bicycle industry. The F-number is definitely not Fairly but the format suggests it represents November 1992. This is 2-6 weeks prior to the date of the Kent serial number. This suggests that the F-number represents the frame's contract manufacturer. Given that both numbers are under the paint, it may have shipped in a phosphated or primed finish, being painted and assembled by Derby's Kent facility.

Given the very late 1992 serial numbers, the bicycle would be a 1993 model. Shimano 400CX and 700CX components were only produced for the 1993-1995 model years, though manufacturing on the 1993 model year components would have started at least as early as mid-1992. As such they should have "Q" though "T" year codes. Typically, Shimano distinguishes between the "O" and "Q" codes by overscoring a backslash (\) though the "Q".