While it's certainly possible, particularly with the yellow pitchers. I would be surprised if the square/rectangular containers were manufactured before 1980. My mom was a "Tupperware Lady" from like 1979-1984 or '85 and I remember the change to the mustard yellow, orange and reddish brown color scheme and then the pastel/almost light mint green colors of those square containers on the right. The pastels were later and might not have been until the later 80's or maybe even early 1990's (we still got the catalogues and some containers even after mom stopped selling it). I've use Tupperware from the time period my mom was selling it pretty much continually (I'm in my later 40's). My family has no issues which could be attributable to lead or heavy metal poisoning.