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US T-Bills use a/360
The link below has pictures and facts about the designs used on US $50 bills since 1928.
The Bills of Rights
The US made 100,000 dollar bills, but none of these were ever in circulation. They were made to be used between Federal Reserve Banks.
If you look at the bills in your wallet, you'll see that every US bill (and for that matter, bills from other countries as well) has similar numbering on it. It's called a serial number and is used both as a bookkeeping device and an anti-counterfeiting measure.Please see the Related Link for a full description of how serial numbers are used on US bills.
Security strips were first used in 1990. They were added to all denominations except $1 and $2 bills.
The colors used are red, blue and yellow ================ According to the US Treasury, only green and black are used on current $1 bills.
The security thread was first used in the Series 1990 notes
There's never been a US $1 million bill. You may be thinking of the $100,000 bills that were printed in the 1930s and only used by the Federal Reserve System. They were never put into circulation.
No. The didn't print any bills dated 1940. In fact, $2 bills used a 1928 series date until 1953, regardless of when they were printed.
Yes, $50 bills are very much in use. In fact some ATMs now dispense $50 bills as well as lower denominations.
Dollar bills do not expire and can be used indefinitely.