[R-390] letter on R-390A front panel - what might it mean?

[Mark Huss]

If it is on the unpainted back of the front panel, it is probibily an 
inspection mark,
Phil wrote:

>My Collins R-390A [1955 run] has some markings on the
>front panel - looks like permanent magic marker - near
>the KC knob.
>
>Being a rather historical person, as well as an
>electronics nut, tube-o-phile and MW DXer, I'm as
>curious as can be as to what they might mean:
>
>There is a slightly styilized "F" which is circled by
>a shape very reminiscent of a 1960's era TV screen - a
>rounded square, if there is such a thing.  Also, near
>this "F" are the letters "AOD".
>
>Any guess as to what this might mean?  I figure that
>perhaps some you you kind folks who worked with these
>babies in the military might know.
>
>One thing for sure - my front panel is in very nice
>original shape and those letters are staying!
>
>Thanks!
>
>Phil Rafuse
>PEI Canada
>
>PS - I bought the R-390A from an ebay guy in upstate
>NY.  R-390A was missing quite a few parts, including
>the PTO, oldham coupler etc.
>
>Phil Rafuse 
>PEI Canada
>
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