Doc44 (a very knowledgeable member) recently posted this:
Directives to eliminate the diamond around the escutcheon and nut on all stocks except NT and KT (target stocks) were issued on October 11, 1965 and January 11, 1966, and marked the beginning of the change to modern style of stock without the diamond. Magna stocks without the diamond first appeared in 1966. The directive to eliminate the diamond around the escutcheon and nut on NT and KT stocks was issued on December 28, 1967. Diamond target stocks were exhausted by January 1969.
The 14-2 was made from 1961 through the end of 1966, and some likely shipped in 1967. So you can draw your own conclusions. It is a near certainty that some later Model 14-2 revolvers shipped with Magna stocks that lacked the diamond. We have no way of knowing how many.