Novemer 3, 1997.
"#97-24 and 97-25 (Corrected): November 2, 1997: CME S&P 500 Futures and Options to split â change to PC-SPAN Contract Value Multiplier
On Monday, November 3, 1997, CME's S&P 500 futures and options will be split. The contract value multiplier will be halved, from $500...