kasper
Finally riding a big boys bike
I have seen a letter missing before (extremely rare) on these bikes.
Being a “long frame” with the first character “A” = Jan. with a space which would be a “B” = 66 in Sky Blue.
The photo shows were the date would be on the inside fork.
This one is a April 1965 Sky Blue.
The depth and consistency of your font date looks odd. Very precise.
The early bike dates were sketchy
The letter missing is not rare it's how the sting Ray's from 63-66 were stamped they only had 1 letter in front of the numbers