In 1983, Baseball Cards magazine listed their pricing in EX-MT condition, which came after MT according to their standard at the time. Baseball Cards used 3 price columns, which also included VG and G pricing.
Here's a clip from my database. I put all the values from the Fall 1983 Baseball Cards issue between OCT83-MAR84 since there was only a Spring and a Fall issue from 1981-1983. Beginning in 1984, there were 4 issues each year. I'm using only Beckett pricing beginning from NOV 1984 onward for now.