The "Challenger" press is almost certainly what you have. It was Lee's original press (IIRC) and was so for years, that's probably what so many folk mean when they say "the" Lee press or incorrectly call it Lee's "classic" press.
I believe the "Challenger" label was referring to it being Dick Lee's challenge to the various "big iron" competitors. It's precisely made of die cast aluminum alloy, pound for pound stronger than steel, not "POT METAL" as some silly detractors still proclaim. (Pot metal is a real metal but it's mostly zinc and does not contain alloyed industrial grade aluminum.)
The Challenger was/is an excellent press for probably 80-90% of the reloading market. Lee wanted to offer something others didn't so he made its lever and toggle block in two pieces that could be moved around in several notched steps. It worked good too but it demanded the user properly tighten the steel bolt that tied the block halves together. Quite a few guys didn't get that message so they allowed the bolt to loosen, that changed the lever pressure angles enough so the aluminum toggle block could split under max pressure (sizing). It was entirely "pilot error" but the press (unfairly) got the heat - and often still does. Lee changed those blocks to steel to make them fool proof and it appears to have worked.
Lee's current big presses, the Classic Cast and Classic Turret, are cast steel and, in my opinion, they are the best designed presses of their types available today at any price.