Personal choice!
KM's 1964-69.
The older KM's are more of a collectors item, in my opinion. If passing along a shottable bow is your main concern, I would rather pass on the older KM's than a new one,.
Hopefully, if you buy a new one, by the tu=ime it comes to pass it on in your estate, it wil lbe an old one; but an old one now will be even older then.
IT WILL HOLD UP... just take care of it.