I would have to disagree with that.
I have a '75 Super Kodiak(blue stripe) and a '73-'75 Kodiak Hunter(green futurewood w/white overlays on the grip), both start with "K", but the SK's first number is 8 and the KH's first number is 7.
To my knowledge the best way to estimate the year a bow was made is what Raineman stated, basically the bow's physical characteristics----wood types, coin(flush/raised), tip/overlay material/color, etc.
Check out the History/Collecting forum here on Tradgang--Wade, Bowdoc and others can help with just about any question of this nature.