Methaqualone was produced by at least two different manufacturers, under brand names like Quaalude and Sopor. It came in capsules and tablets, and there were a variety of sizes of each. But one indeed did say “714” on it.
The abuse potential far outweighted any benefit from the drug. I recall the marketing blurbs before it got pulled (aimed at physicians): “For when your patient really, really, really needs to go to sleep, use Quaaludes!”
Well, my patients have never needed to sleep quite that badly.
I’ll second that. (not that it needs a second) I knew a kid when I was 19 or so who was on Quaaludes prescribed by his doctor. Veeery strange kid, hyper even on Quaaludes. He used to take 1/2 doses so that he could be “pretty normal” yet still save up tabs to sell to others.