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.
The red seal indicates that your bill is a United States Note, a form of paper money issued from 1862 to 1966. US Notes were issued directly by the Federal Government instead of through the Federal Reserve System (the central bank). They were completely interchangeable with Federal Reserve Notes, so production was consolidated to save printing costs. All US paper currency is now issued by the Federal Reserve.
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.
10 dollars
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.
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 20-dollar bill with a blue seal indicates that it is a Federal Reserve Note, which is the standard currency issued by the U.S. government. The blue seal represents the Federal Reserve Bank that issued the bill. Regardless of the seal's color, a 20-dollar bill is worth its face value of $20. However, if it is an older or rare version, its collector's value could be higher.
A red treasury seal indicates that the note is issued by the United States, instead of the Federal Reserve