Are the official years of Kennedy half NIFCs actually known? Confusion among sources

shaney777

Are the official years of Kennedy half NIFCs actually known? Red Book has a range listed, but according to Coin World, these years are not unquestionably correct. Reportedly for several of the years that Red Book calls NIFC, collectors have found UNC rolls at banks, suggesting they're not indeed NIFC. I emailed a main Coin World writer and he hasn't ever received a response from the Mint regarding which years the Federal Reserve ordered halves. So how do you figure out the fact of the matter?

WAYNEAS

This might help you with your inquiry.
https://www.thesprucecrafts.com/kennedy-half-dollar-mintages-4075997
Wayne