I believe the F would be the first year (75) or F0 and the 76 was the F1, 77 was the F2 and 78 was the F3. I know mine is an F1 being
it is a 76. The F frames are longer than the K's but not sure if there is any difference between the 75 and 76. Now I could be wrong but I
think that is how it...