Those in your picture were almost certainly painted by someone - I have 4 ART-13’s and none look like that and that’s the first one I have seen like it.

73’s

Don W

KD 4APP

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From: [email protected] <[email protected]> on behalf of Hubert Miller <[email protected]>
Sent: Wednesday, February 25, 2026 6:52:30 PM
To: [email protected] <[email protected]>; arc5 <[email protected]>
Subject: [Milsurplus] ART-13 knobs question

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