It is worth about $5,600. This is because they only made several of those bills. I will buy this bill for my collection from you for about $3,000.
Auction values for a 1928 $100 gold certificate in uncirculated condition are in the $1350 range. However I question the "1928A" because my listings do not show a 1928A series, only 1928. You'll need to have the bill authenticated by a dealer or appraiser.
There were no 1928A gold certificates printed, only 1928 with no series letter. (Series letters, when present, are next to the date, not beside the serial number or elsewhere.) If you have a plain 1928 bill, its value would range from $250 in worn condition to about $750 if it's only slightly worn.
You probably mean 1928a...those are worth about $125 on average. Things like the condition and serial number can make them worth more.
Retail is about $150
Retail prices range from $65 to $95 depending on how worn it is.
The average buying price is $20 a good condion 1928 bill a 1928A bill and a 1928B bill. The most valueable in Good condition is a 1928E bill whitch goes for $200 in circulated or good condition. The value for a Very fine bill is $25 for a plain 1928 bill. For a 1928 C bill is $750 and for a 1928 bill in uncirculated condition is $140. For a 1928 E in uncirculted condition it is $2650.
$5 (retail) if worn, $10 in better shape.
$22 to $45 depending on condition
The face value of ANY bill or coin is simply another word for its denomination. Thus any $1 bill has a face value of a dollar, a $100 bill has a face value of one hundred dollars, and so on.The collector value of a bill or coin can be very different, depending on a number of factors. For more information about a 1923 $1 bill please see the question "What is the value of a 1923 US 1 dollar bill?"
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The US Treaury only printed $10 Gold Certificates bearing the Series Date of 1928 and 1928A.