After reseraching more on the Internet, I have learned that Ludwig made some COB Supraphonics in the 70s. They said that the shells are stamped with a "B" or "BR" and that the B/O badge is referred to as the cutoff badge, because it has the serial number cutoff the botttom.
My question is have any of you owned or heard both of these drums and are the older preserial 60s better sounding than the 70s? It seems to me that it maybe easier for me to locate a 70s model and because it's not the vintage years buy one a little cheaper. But after that being said I don't want to buy an inferior sounding drum. I would rather get it right the first time.