Hi John,
This has been gone over in the past and I think it was decided
that just like the auto makers make next years models this year.
That seems to be what Cessna did.
My 1980 model 152 came off the line in August of 79.
So even though your plane was built in 65 it is a 66 model to
Cessna and every one BUT the FAA.
1966 F model has SN#15061533 thru 15064532
Yours (SN 15061899) would have been the 366th F model produced out of the 3000 total.

Ron


Ron Stewart
N5282B
KSFZ


[Linked Image from visitedstatesmap.com]