The thread is embedded in (not printed on) the paper and operates vertically through the very clear subject for the still left with the Federal Reserve Seal. On genuine bills, This could be conveniently seen against a light supply. Francis Greenway was an English-born architect transported to Australia in 1814 https://cesarejmev.alltdesign.com/examine-this-report-on-counterfeit-banknotes-for-sale-47848685