QUOTE(jtryka @ Dec 20 2005, 04:37 PM)
The only anti-counterfeiting features on bills before series 1990 are the paper (linen fiber with the blue and red threads) and the quality of the printing. It's difficult to say without seeing them, but it would be quite unusual to encounter a counterfeit 1950 series note in circulation given the significant differences in design from today's currency and even from the "old style" $20 notes. Most counterfeiters want to create fakes that will not draw attention to themselves, and trying to pass off currency that last circulated in the 1960s would not be an effective way to do that!
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I know when I get the older style small head notes now I give them a twice over that I usually do not give the newer notes. Face it, they are kind of a curiousity to get in circulation now. My 1950-C $20 rcvd recently was the oldest note in about a year, last year I got 2 1934 series $20's locally. I live in an area with a lot of older residents, so it is not unusual to see older stuff coming out of hibernation. Just wish I could find some Saint Gauden's $20's so easily.