1964 Kennedy Half Dollar

Pics are a bit blurry, looks more like toning so far and with better pics others can confirm. Heres an article on the 1964 sms including kennedy halfs perhaps 28 exist as PCGS graded examples https://www.PCGS.com/news/1964-spec...nt-set-coins

Others for 1964 include circulation strike, proof and accented hair proof and some info on the 'look' such as cameo and deep cameo
https://coinweek.com/modern-coins/t...-and-values/

Also general further info about the SMS sets 65-67
In 1965, the U.S. Mint discontinued issuing both Proof and Mint sets. However, as an alternative, the Mint began offering what are known as Special Mint Sets. The coins in these sets had a special finish that was most akin to the Satin Proofs of 1936 -- far better than the finish on a regular Mint State coin, but not nearly as brilliant and reflective as the finish on the Proof coins of 1937 to 1964. Collectors purchased over 2.6 million 1965 sets, but only because they had no alternative. This amount was far below the number of 1964 Proof Sets sold (3.95 million) and the total of all 1964 Proof and Mint Sets sold (4.96 million), thus the Mint took a serious hit to its revenue stream. The Mint issued Special Mint Sets in 1965, 1966, and 1967, and each year saw a declining mintage. In 1968, the Mint began offering regular Proof and Mint Sets. Collector enthusiasm returned and the mintages returned to their pre-Special Mint Set levels.

These coins are silver. Silver can tone a beige-brown colour when exposed to atmospheric pollutants. Tobacco smoke is a common cause, though of course tobacco-afflicted coins usually have a unique smell to them.

to the CCF!

with the above comments on this silver coin