It is simply a serial number. Using the numbering system devised by the BEP with single character alphabetic prefixes and suffixes and 8 digits, 62.5 billion notes can be printed in a denomination and series with unique serial numbers. They have never exceeded this limit.
"Valuable" 1957 silver certificates are an urban legend. They were saved in huge numbers and sell for about $1.50 in decent condition, maybe $3 uncirculated.
These were saved in great numbers and retail for about $1.25. Note that ALL 1957 silver certificates have the motto on them, as required by a 1955 act of Congress.
Huge numbers of 1957, 1957A, and 1957B $1 silver certificates were printed. None of them is rare; in fact even today they sell for $1.25 to $1.75 in average condition.
a mint condition silver certificate is worth $5-$6.
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.
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.
All silver certificates printed from 1928 to 1957 had blue seals. Please see the question "What is the value of a 1957 A US 1 dollar silver certificate?" for more information.
Nowhere, unfortunately. Unless it has a spectacular printing error, NO 1957 $1 silver certificate is worth more than a few dollars.
$1.10 to 1.50
It is worth caca
The 1957 silver certificate was only issued in $1 denomination. An uncirculated mint condition note is worth $10. (Fine condition = $2).
Please check again. The only silver certificates dated 1957 were $1, not $100.