At first glance the National Super-Regenerative Revceiver (SRR) looks likes
like a SW-3. It's smaller, though, and knob layout isn't quite right. It
was sold with a 5 meter (56MC - 60MC) coil but coils for 160, 80, 40, 20
and 10 meters were also available.
The SRR used a type 36 screen grid regenerative detector, a type 37 quence oscillator and a type 89 pentode audio amplifier.