[R-390] Black Panel R-390A

[Bill Keller]

I was one of those military spooks assigned to the NSA at a location in the late 1950's that is, to this day, still secret.  I had both an SP-600 and an R-390A at my operating position for voice intercept..  I recall that the SP-600 had the standard grey panel, but the R-390A, while not exactly black, was a very dark shade of grey - something like charcoal grey.  Not trying to keep this discussion going - just putting in my two cents worth.
Bill K.