Gula, it is unlikely you have an SMS 1964 cent, as there were only a few sets minted that year. PCGS has only graded 22 1964 SMS cents, and the speculation is that the population is even lower, with coins cracked out and resubmitted. Source: http://www.PCGS.com/News/1964-Speci...nt-Set-Coins
Dennman, SMS is not cent specific, but stands for Special Mint Set. From 1965-1967, the mint produced no proof sets, issuing these special mint sets instead.
CoinCollector, there were probably fewer than fifty of the SMS cents minted. PCGS has a MS60 RB listed for $1250 in their price guide, so it would probably be worth at least a few hundred bucks in this condition if it was an SMS strike.
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