The best place that I could find that has listings of years that each denomination is printed is the dollar bill tracking site where's George. None of the denominations are printed yearly, which does seem counterintuitive, but bills do last for several years.
The "series" date is based upon the year the Secretary of the Treasury assumed his position; in this case "2006." It has nothing to do with the actual date of issuance.
That date is used until a new Secretary of the Treasury takes office, meaning in this case we should be seeing at least some bills "series 2009."
Some "series" dates have an "A" or a "B" (rarely a "B" though) after the date, such as, say, 2006A.
The letter is added in those instances where a new U.S. Treasurer takes office, but the Secretary of the Treasury remains the same person.
I checked at the bar in town last night, where the owner had her spare cash, including a bank-bundled $50 worth of brand new crisp $1 bills. Never used, even in serial-number order. Gotten at the bank last Thursday, she thinks.
All of those, brand-new bills remember, were "series 2006."
This is all very odd; one wonders why Bo is having currency printed without changing the printing plates. If one were a conspiracy theorist (which I'm not), one might suspect Bo is "prepping" us for ruinous inflation by lying about under whose administration the currency was printed.
Has anyone anywhere seen a bill
later than "series 2006," and with the signatures of the
current U. S. Treasurer and the
current Secretary of the Treasury? Check your wallets, disregarding the older bills and just glance at the crisp new ones, if any. Any denomination, but most likely a $1 bill or a $20 bill.
It's just very odd. There could be a harmless explanation for this, but this is the first time I've seen this happen, 10 months into a new presidential administration, and no bills showing the current monetary officials; only those from George Bush.