It looks like you may have missed a number between the 0 and the 6 that is partially concealed under your cable. Assuming that there is a number there, this format seems to work to ID your bike's model year. I'm going to guess it is a 1980 bike made in October of 1979.

FJ910x67

http://www.bikeforums.net/showthread...umber-Database

SERIAL NUMBERS 1980-1987*:

Serial number format WXYZZZZZ where;

W = a letter, presumibly indicating a Fuji facility or contractor. To date, samples have included F, I , J, K & S.
X = a letter, indicating the calendar month of manufacturer (A = January, B = February, C = March, etc)
Y = a number, indicating the last digit of the calendar year of manufacture (0 = 1980, 1 = 1981, 2 = 1982, etc.)
ZZZZZ = a five digit number sequence, probably indicating frame number during month

Example: FB125349 indicates the 25,349th frame manufactured during February 1981.

*The serial number format may extend beyond 1980-1987, in either direction, but to date, data samples lie within this range.