Not exactly what you asked for, but a different looking 7 ball. Any billiard dealer that buys from Imperial USA can get this ball for you if you can't wait for Mueller's next free shipping promo. http://www.poolndarts.com/p-5966-Belgian-Aramith-Seven-Ball/
I think you are talking about the Legends tournaments that featured Pucket, Mosconi, Fats, Lassiter, etc from the 80's. They played 7-ball and Lassiter had the better of it.
I thought I heard at the time the Legends of Pocket Billiards tournament was first run on ESPN that the 7-ball used was a special design and was "copyrighted" by Charlie Ursetti who was the promoter/referee of the event...
The Aramith ball posted by EDRJR is the same thing only not maroon and black...
I have some, still in the box with a 7-ball rack I think. Will have to dig through the mountain of pool crap to make sure. I bought out a billiard supply ages ago. Might take a day or two. If I find them, I will check this thread and and get back to you.
If you happen to find them, I'd be interested in purchasing one along with the 7 ball rack if they come together. Have never seen one like this before and it might be a nice addition to my pool room.
Says you're Texas Express. Where in Texas? I might come and help you look. Send me a pm.