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.
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.
Please don't assume that every old bill is a silver certificate. As indicated by both its green seal and the banner over Franklin's portrait your bill is a Federal Reserve Note, not a silver certificate. The last $100 silver certificates were dated 1891. See the question "What is the value of a 1934 US 100 dollar bill?" for more information.
Please don't assume that because a bill is old it has to be a silver certificate. As the banner across the top and green seal indicate, your bill is a Federal Reserve Note. See the question "What is the value of a 1934 US 100 dollar bill?" for more information.
All 1966 US $100 bills have red seals. If yours is gold it could be faded or was exposed to a chemical such as bleach. Either condition would reduce its value to a collector. Please see the Related Question for values of undamaged 1966 $100 bills.
Please don't assume that just because a bill is old it must be a silver certificate. The 1963 series of $100 bills were only printed as green-seal Federal Reserve Notes, and the last silver certificates were $1 bills dated 1957. There's more information the at question "What is the value of a 1963 US 100 dollar bill?".
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.
The US never printed 100 dollar silver certificates with this date.
Please don't assume that every old bill is a silver certificate. The banner across its top and the red seal indicate it's a United States Note, a form of paper money issued directly by the Federal government. US Notes were discontinued in the 1960s. There's more information at the question "What is the value of a 1966 A US 100 dollar bill?".
1928-series $100 bills weren't issued as silver certificates, only gold certificates and Federal Reserve Notes. Please look at the bill's front to determine which you have; then check one of the following: "What is the value of a 1928 US 100 dollar Federal Reserve Note?" "What is the value of a 1928 US 100 dollar gold certificate?"
Please don't assume that every old bill is a silver certificate. As indicated by both its green seal and the banner over Franklin's portrait your bill is a Federal Reserve Note, not a silver certificate. The last $100 silver certificates were dated 1891. See the question "What is the value of a 1934 US 100 dollar bill?" for more information.
Please don't assume that because a bill is old it has to be a silver certificate. As the banner across the top and green seal indicate, your bill is a Federal Reserve Note. See the question "What is the value of a 1934 US 100 dollar bill?" for more information.
All 1966 US $100 bills have red seals. If yours is gold it could be faded or was exposed to a chemical such as bleach. Either condition would reduce its value to a collector. Please see the Related Question for values of undamaged 1966 $100 bills.
Please don't assume that just because a bill is old it must be a silver certificate. The 1963 series of $100 bills were only printed as green-seal Federal Reserve Notes, and the last silver certificates were $1 bills dated 1957. There's more information the at question "What is the value of a 1963 US 100 dollar bill?".
Please don't assume that every old bill is a silver certificate. The banner across its top and the green seal indicate it's a Federal Reserve Note, the same type of paper money used today. There's more information at the question "What is the value of a 1928 A US 100 dollar bill?".
Please check again. The only silver certificates dated 1957 were $1, not $100.
Please don't assume that every old bill is a silver certificate. As the bill's green seal and banner across its front indicate, it's a Federal Reserve Note. There's more information at the question "What is the value of a 1934 US 500 dollar bill?".
Please check again and post a new question. No US $100 bills are dated 2000, and the last $100 silver certificates were printed in 1891.