All Federal Reserve Notes, Silver Certificates, and Unites States Notes are still considered to be legal tender and can be spent just like more recent currency.
However, the most important question is whether it makes sense to spend an older bill at face value if it might be worth more to a collector. In the case of a 1934 $10 bill with a green seal, if it's very worn it probably isn't worth much more than $10 anyway. But if it's in better condition it might sell for $12 to $15. And if it has a blue seal, it could be worth anywhere from $20 to $300 depending on its condition and series letter, so if you take it to a store it better be a coin and currency dealer.
Yes. US money doesn't have an expiration date.
Your bill was actually printed in Washington for use in Hawaii during WWII. Please see the question "What is the value of a 1934 US 5 dollar bill with HAWAII on it?" for much more information.
Your bill isn't really from Hawaii. It was printed during WWII for use in that territory. Please see the question "What is the value of a 1934 US 20 dollar bill with HAWAII on it?" for more information.
Despite the 1934 date, yellow-seal bills were actually printed during WWII for use by troops in North Africa. More than one denomination was issued; please see the following questions: "What is the value of a 1934 US 1 dollar bill with a yellow seal?" "What is the value of a 1934 US 5 dollar bill with a yellow seal?" "What is the value of a 1934 US 10 dollar bill with a yellow seal?"
Your bill isn't really from Hawaii. It was printed during WWII for use in that territory. However, the date on a Hawaii-overprint $1 bill should be 1935 rather than 1934. Please check your bill again, and see the question "What is the value of a 1935 US 1 dollar bill with HAWAII on it?" for more information.
To clarify things:The bill isn't from Hawaii, it was printed in Washington for use in that territory during WWIIThe seal color is brown rather than redPlease see the question "What is the value of a 1934 US 5 dollar bill with HAWAII on it?" for more information.
No 1934-series $20 bills had red seals.If the seal color is brown and the word HAWAII is overprinted on both sides, your bill is a special issue printed during WWII for use in Hawaii under threat of invasion by the Japanese. Please see the question "What is the value of a 1934 US 20 dollar bill with HAWAII on it?" for more information.
Despite the 1934 date, yellow-seal bills were actually printed during WWII for use by troops in North Africa. More than one denomination was issued; please see the following questions: "What is the value of a 1934 US 5 dollar bill with a yellow seal?" "What is the value of a 1934 US 10 dollar bill with a yellow seal?"
No 1934 US $10 bills were printed with red seals. However a special series was printed with brown seals for use in Hawaii during WWII. If your bill has HAWAII printed on the front and back, please see the question "What is the value of a 1934 US 10 dollar bill with HAWAII on it?" for more information.
There are many varieties of US $20 bills that have brown seals, but only two types were printed in the 20th century - the 1929 series of National Currency Notes and the 1934 series of wartime currency printed for use in Hawaii.Please see the questionsWhat is the value of a 1934 US 20 dollar bill with HAWAII on it?What is the value of a 1929 US 20 dollar bill?
Please check your bill again, to the lower right of Jackson's portrait. You'll see that the date is 1934 and the bill was printed in Washington.The brown seal and HAWAII overprint were used on special bills made for use in that territory during WWII. Please see the question "What is the value of a 1934 US 20 dollar bill with HAWAII on it?" for more information.
I found a bogus ten dollar bill in front of the grocery store today.
Assuming the bill has a standard green seal, 1934 A $20 bills remain common among collectors regardless of the Federal Reserve district that distributed them. Those with brown seals that were specially-printed for use in Hawaii during WWII can be more valuable. There's more information at the question "What is the value of a 1934 A US 20 dollar bill?"