It's not now redeemable in gold, so it's value is determined by collector demand.
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.
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.
If very worn, $250; if nearly new, $750.
On the 5 dollar bill: Redeemable in gold on demand at the united states treasury or in gold or lawful money at any federal reserve bank. 1928 series A A.W. Mellon secretary of the treasury
Could be worth something, depending on its condition and variety (signature combinations, variants, etc). Send a scan, I appraise for free: support@papermoneysite.us and will buy notes too.
All 1928 $100 FRNs carried the wording that they were redeemable in gold. There's more information at the Related Question.
All 1928 $5 Federal Reserve Notes carried the phrase "Redeemable in Gold", although they weren't gold certificates and in fact no gold certificates with that denomination were printed. Please see the question "What is the value of a 1928 A US 5 dollar Federal Reserve Note?" for more information.
$60 if worn, up to double that if in nearly-new condition.
All 1928 $20 Federal Reserve Notes carried the phrase "Redeemable in Gold", although they weren't gold certificates. There were also gold certificates with that denomination but they have gold seals and lack the words Federal Reserve Note. Please see the question "What is the value of a 1928 US 20 dollar Federal Reserve Note?" for more information.
It is worth a 100.00 today
A 1928 US Peace Silver Dollar is worth approximately $20 to $130 if it is a coin that has been circulated. Uncirculated coins can command upwards of $600.
Hi, a 1928-D Peace Dollar is worth $14.00 :)
Even though your bills have the phrase "redeemable in gold" on them they're Federal Reserve Notes rather than gold notes. $10 gold certificates were also printed in the 1928 series but they don't have any series letters. 1928 A $10 FRNs are definitely worth more than 1928 B bills, but the difference depends on the issuing Federal Reserve Bank letter. Please see the questions "What is the value of a 1928 A US 10 dollar bill?" and " ... 1928 B ... " for more information.