Supposedly, there are historical dataset for some futures markets that have the Tag50 ids for each order (I recall reading a paper that was using it to impute some improbable sh*t). Even that sounds like a massive gold mine unless it's very old.
%% Good points/good post. [IBD]; investors.com has some info on that topic, mostly stocks.BUT even they went from Investors Business Daily newspaper, to weekly newspaper. But they kept the same name .LOL