Your lucky to have that one Gomer.! Drueke made the best weighted plastic sets & were seamless. They were truly ahead of their time.
Yeah, I am lucky. I walked into a game store in Virginia about 1990 or 1991 to buy a good plastic set. I didn't know Drueke from Drano but I knew I liked the pieces so I bought it. I was going to try find a chess club to play with but I ended up moving and I've barely used the set.
My pieces aren't seamless, though. They have the same ridge you can see in TurboFish's first post.
I agree that these pieces are very nicely weighted. And their slender shapes make them even more bottom-heavy, and less likely to topple over during fast games.
Speaking of fast games, I never allowed anyone to use my Druke set for speed chess since I was afraid that the delicate points on the queens' crowns would be broken off. I'm sure I'm not the only one to protect nicer sets, not using them much for actual games, except with calm and gentle friends.
My admiration (and protectiveness) of good looking chess sets does not mean I have a fetish for the pieces. It just means that I still have the capacity to enjoy beauty (and I don't like to see expensive artwork unnecesarilly damaged).