[ARC5] ART-13 knobs question

[Hubert Miller]

I  had never noticed the difference in color of the knobs on the ART-13.
Kinda reminds me of this puzzle in the local newspaper - "Find 6 differences in the drawings"
and the tendency is to overlook what's "not important".
So why the red knob skirts and some black ?
Photo via Julyah, pres of the PSARA antique radios club.
-Hue Miller
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