They all should have serial numbers if not you have a counter fit
Silver certificates don't always have a letter in the beginning of the serial number. They can have a star. Otherwise they all have letters.
The worth of a silver certificate with serial # 60292929 is about $3 to $5 if it is in uncirculated condition. Unfortunately, this serial is not a true repeater. It needed to be 29292929. However, it is still a cool serial.
The serial numbers on small-size US $1 silver certificates are in the same place as the serial numbers on modern $1 bills - the lower left and upper right corners of the open area on the bill's face. Serial numbers on $1 and $2 bills have 10 characters - a letter, 8 digits, and another letter. $5 and higher denominations have 11 characters, with 2 letters at the start of the serial number.
It will have the words Silver Certificate printed across the top of the bill's front. In most but not all cases, the seal and serial numbers will be printed in blue ink.
not rare at all they are counterfeit broski
Silver certificates issued from 1928 to 1957 are easy to identify. They have distinctive blue seals and serial numbers, and the words "Silver Certificate" are across the top of the bill's front. Older bills may or may not say "Silver Certificate", but will have some reference to "Payable in silver", "Redeemable in Silver Coin", or similar phrasing.
A star in front of or after the serial number on any US bill (not just a silver certificate) means it was printed to replace a bill that was damaged during production. The damaged bills cause a break in the serial number sequence of their print run. Because bills are printed in large groups it would be very difficult to re-use missing serial numbers; each bill would have to be reprinted individually. Instead, the replacement notes have their own set of serial numbers with a star instead of one of the letters to indicate that their status.
Silver certificates don't have Federal Reserve letters or numbers because they were issued directly by the Treasury, not through the Federal Reserve system.
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To clear things up, it's a silver certificate, not a silver certified bill, and 1935 D is the bill's series date. The serial number is the 10-character combination of 2 letters and 8 numbers that's printed twice on each bill as a counter and security feature.There's more information at the Related Question.
Bills with this error can sell for anywhere from $100 to $200 depending on their condition and how far out of sync the two numbers are. Mismatched serial numbers can occur when one of the counters that prints the numbers gets stuck and doesn't keep in sync with the other one.
A star in the serial number of any bill, not just a silver certificate, means that the original bill bearing that serial number had a defect and was destroyed. Because bills are printed in large groups it's impractical to reprint specific serial numbers. Instead, a new set of serial numbers is started and a star is added to indicate that these notes are replacements. Collectors generally prefer star notes and it may make the bill be worth a bit more.