I remember that thread too. I spent a few minutes looking but couldn't find it. It was talking about silver certs with high prefix letters. I recall posting my "Y" one in that thread too.
"The largest section of the site is devoted to the serial number tables. Here you can find almost-complete information on the overall serial ranges for all small-size regular and star notes, Series 1928 to present. From 1976 to the present, the serial ranges are also broken down by month of production."
-----Burton
50+ year / Life / Emeritus ANA member (joined 12/1/1973)
Life member: Numismatics International, CONECA
Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club
Owned by three cats and a wife of 40+ years (joined 1983)
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