Dan C...
Your's sounds like a DuAll snare, very rare, very cool.
Slingerland tried to answer Ludwig&Ludwig's parallel snare throw, but they were unsuccessful. It was basically a copy of Ludwig's. They were taken to court over it, and had to stop production as Ludwig owned the rights to the parallel strianer. Slingerland then came out with the DuAll, as a "modified" parallel throw. If it's the snare I'm thinking of, your drum has cables inside driving both sides of the throw, correct? Very expensive to produce, so only a handful got out to the public. I believe Cook's Slingerland Book contains info on it... I'm sure someone will correct me if I'm wrong, but I think that's the story...
