At long last, I found a beautiful pair of matching vintage Ludwig model 1402 "Atlas" cymbal stands. These stands are the earlier first generation versions. I have included some photos of the two cymbal stands, then a shot of a pair of tripod bases, the taller tripod on the left is the later, second generation model.
The next photo shows two center tubes, the tube at the top of the photo is the older variation, with a "coke bottle" shape to it. The later second generation version has a longer, tapered sleeve.
The picture with the tilter assemblies has the older model on the left. This tilter is flatter and lighter in weight, and it has a shorter threaded cymbal rod.
I have "discovered" only a few of these earlier Atlas cymbal stands in my 30+ years of buying and selling vintage drums. They command a premium price because John Bonham used them in his setup, during his time with Led Zeppelin.