[R-390] R390 Number Stamp Under ID Plate

[Jacques Fortin]

Hello Tom,

I believe that the significance of those numbers is relative: every
sub-assembly in those radios bears a serial number, including the front
panel, and those numbers did not necessarily match each other.
I do not believe that it was initially a manufacture intent to produce the
whole radio with sub-modules serial numbers matched to the "top" one.
My own R-390 have a ID plate with the serial 2074 but the number stamped
under it, in black, is 2090.

73, Jacques, VE2JFE in Montreal
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