The term "Supraphonic" stemmed from a far simpler time in drum marketing history. A time when Ludwig only offered the US made, spun, seamless, aluminium shell (I think....SteveB can you clarify?.....pretty sure there were no BB's in the early 60's), Imperial lugs and offered two types of snare mechanisms, the Super-Sensitive (P-70) and the Supraphonic (P-83). So it was easy to define, if the drum wasn't a SS it was a Supraphonic.
Add several decades, a couple of strainer upgrades, the emergence of a couple more shell materials (brass Black Beauty, COB and bronze), the addition of tube lugs and the guidelines of what exactly constitutes a Supra have become far more cloudy.
Personally, I wouldn't call a 13" bronze piccolo a "Supra" but that may just be the traditionalist in me.
Ludwig introduced the supraphonic around 63 as well as the acrolite,which used the same shell.The first prototype acros,had welded shells and a backing plate at the weld.
That design was soom rejested ,and both drums were spun from a single piece of aluminum alloy(ludalloy) of aluminum and zinc.
Till Ludwig started introducing different metal like brass and bronze,the supraphonic was aluminum only,save for a few COB "cut B/O badge" and keystone badge drums in 68 and 70.
When these other drums becoming popular in the 80,after Ludwig re introduced the BB in 77,they started calling al US made 5 and 6.5 x 14 drums(except the acrolite) surpaphonics.They even call the BB a supraphonic now.
Ludwig wasn't the only company to have an aluminum shell snare drum.Slingerland ,introduced the student model in 63,on the heels of the supra and acro.The slingy drum was welded,and not beaded.
The drum that BGH posted a link to...is NOT a supraphonic.It's the model LB553,and considered a piccolo by Ludwig,and not a supra.The pic in the advert is incorrectly lumped together with pics of a LM 402.Not nearly the same drum.
So to answer what's NOW (were talking Ludwig here) considerd a supraphonic,is any US made metal shelled snare drum,in aluminum(exceprt for the acrolite),bronze(except for the piccolo),and brass,(except for the piccolo brass and BB piccolo)
The shell must be a beaded, 5 or 6.5x14.So...no metal piccolo supras,in aluminum,brass or bronze.
Short answer....MUST be US made,MUST be spun/ beaded shell,MUST be 5 or 6.5x14(except the acrolite) =supra.
Steve B