it`s gonna come back as duplex or sonor. Both used red copper and screw adjustment tension snares. Because there is no triangle stamped into the shell i lean towards duplex. They did the hoop t-rod attaching and fancy thumb nuts on single tension snares. Both made them in piccalo sizes too. That leg brace screems sonor. I found a similar duplex that makes me think duplex. I`ll try and find that sonor marching leg piece too. Look at the strainer on this duplex. I`ve learned that if it`s a fancy copper snare, and it`s not a sonor,...it ends up being a duplex.
thank you!!