It's almost certainly a copy or replica. There were only a few of the real bills printed and they were never used in commerce. They were intended to facilitate the transfer of large amounts of money between government departments in the days before electronic transfers.
It depends on the condition of the note. If it is in well circulated, worn condition, it could be worth up to $100. If it is in crisp uncirculated condition, it could be worth thousands, or even tens of thousands, depending on the series/signatures. In no case is it worth less than $50, and there is a premium attached to all gold certificates, regard of condition.
If truly mint condition, it is worth at least $2,500 Please post a new question with the bill's date for a more accurate valuation.
The worth of a 1928 fifty dollar bill redeemable in gold on demand in very fine to AU condition will vary. You will need to take it to a collector, or someone who can appraise money. Without actually seeing it, it is hard to put a price on it.
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The US government withdrew from the gold standard in 1934, therefore the later printing do not have the appreciable value of those printed during the gold standard. The actual value of the bill is dependent upon the condition of the bill.
The most valuable coin in decent condition would be the 1933 Double Eagle $20 gold coin, worth millions of dollars. The most valuable bill would be the 1890 Grand Watermelon $1000 bill, also worth millions.
They are worth about 76 dollars for the gold. They are worth more if they are in excellent or mint condition.
A 1928 $50 bill that is redeemable in gold on demand is known as a Gold Certificate. These certificates were issued during a time when the US dollar was backed by gold. As a collectible item, the value of the bill would depend on factors such as its condition and rarity. They can be worth more than their face value to collectors and currency enthusiasts.
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The value of a 1953 gold 2 dollar bill will vary. The value will be determined by the condition of the bill and by the current supply and demand for it.
Uncirculated condition would be worth $875. Fine condition would be worth $125.