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During its hyperinflationary period Zimbabwe issued a $21 trillion bill. However that was in Zimbabwe dollars, not US dollars, and was only worth a small amount. If you expand your question to other currencies, Weimar Germany printed a quadrillion-mark (1015 marks) note as a result of post-WWI hyperinflation. It too was worth only a tiny amount.
No, there were no $10,000 silver certificates Moreover, silver certificates were never issued by the Federal Reserve System. They were issued directly by the US Treasury.
During its hyperinflation period Zimbabwe issued a million-dollar bill. However those were Zimbabwe dollars, not US dollars, and the bill was actually worth only a few US cents.
A 1963 5 dollar red seal indicates US Note rather than Federal Reserve because it was issued as part of the United States Note series. United States Notes were a form of paper currency issued by the U.S. government directly, while Federal Reserve Notes were issued by the Federal Reserve System.
Please don't assume that every old bill is a silver certificate. The banner across its top identifies your bill as a Federal Reserve Note only. There's more information at the question "What is the value of a 1914 US 50 dollar bill?" Federal Reserve Notes were very different from silver certificates and were never combined. Silver certificates were issued directly by the Treasury and were backed dollar-for-dollar with silver on deposit. Federal Reserve Notes are issued by the Federal Reserve Bank and are not backed with precious metal.
All U.S. dollar bills have a letter A through L to indicate a Federal Reserve Bank branch where the bill was first issued. K refers to the Federal Reserve Bank of Dallas.
The last Australian Two Dollar notes issued for circulation were issued in 1985. If you have a "1988" Australian Two Dollar note, it was issued by the Reserve Bank of Australia as a collectible in a green folder to mark the withdrawal of the Two Dollar note. The Two Dollar coin was first issued in 1988. If you have any doubt, take it to a reputable coin dealer who will positively identify the note for you.
If you're referring to US, Canadian, Australian, or New Zealand dollars, there is no such bill. However during 2008-2009 the kleptocratic government of Zimbabwe allowed hyperinflation to run rampant and bills with denominations of up to a trillion Zimbabwean dollars were issued. They were almost worthless for ordinary transactions.
10 dollars
Please see the question "What is the value of an 1899 US 2 dollar silver certificate?"The Federal Reserve System wasn't established until 1914.Silver certificates were issued directly by the Treasury and weren't connected to the Federal Reserve Bank.
A red treasury seal indicates that the note is issued by the United States, instead of the Federal Reserve
At least $100 trillion ($Z 100, 000, 000, 000, 000.00). I have one as a souvenir of my recent visit (mid-July 2009). I don't know if it's the largest, but it's the largest I could find being sold (as a curiosity) in Zimbabwe. Note that Zimbabwe issued four different types of currency before their dollar was suspended from trading, and that the $Z 100 trillion note was printed in 3rd currency (1 trillionth of the value of 4th currency). Therefore 4th currency notes (Issued early 2009) are technically worth a trillion times more than the 3rd currency versions (but have lower face values). According to the previous answer to this question, the value of 4th currency was "$10 million = $130 euro" (in 3rd currency terms this is $10, 000, 000, 000, 000, 000, 000.00 = $130 euro). I don't know if this answer was accurate or up-to-date.