Hi Mike - sounds like you have a National NC-200 or NC-240D receiver.
When restored and working properly, thi is a very nice 1940's receiver.
The NC-200 is pre-war and the NC-240C and NC-240D are early post war.
Basically, the three receivers are pretty much the same with minor
differences.
Dave N7RK
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Dave N7RK Boatanchors Home Page: http://members.cox.net/n7rk
Phoenix, Arizona *DXCC Honor Roll* *WAZ#22 - 75 Meter SSB*
ex-XE2/N7RK, N7RK/ZB2, VK2ERK, ZM0AJN, WB6NRK, WN6IWX
Boatanchor and Antique Radio Collector
