Please don't assume that every old bill is a silver certificate. The last $100 silver certificates were printed back in 1891. The red seal and banner reading "UNITED STATES NOTE" at the top of your bill indicate it's a US Note rather than a silver certificate.
Please see the question "What is the value of a 1966 US 100 dollar bill?" for more information.
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The red seal as well as the banner across the top of Franklin's portrait indicate your bill a United States Note and not a silver certificate. Please see the question "What is the value of a 1966 US 100 dollar bill?" for more information.
1966 Kennedy half dollar is 40% silver and valued at about $2.50 for the silver.
For a circulated 1966 Kennedy half the value is only for silver about $1.00
Kennedy half dollars dated from 1965 to 1970are only40% silver. A 1966 is not rare, most are only valued for the silver about $5.
The last US silver certificates were $1 bills dated 1957. Please check your bills again and post a new question.