Apparently, yes. It may have been somewhere around the 1960's or so. There is not much documentation other than the word of a few but as to the system Isshinryu there are a couple of black and white photo's of Tatsuo-san wearing what appears to be a red belt with a gold stripe through the center. The photo of Tatsuo-san is dtd around the mid-sixties, i.e. 1966 - 68.
It would be nice to see the entire belt system from the Okinawans but alas all my inquiries have been, to date, ignored. The belt system seems to have fallen out of favor since the sixties and except on rare occasions the Okinawan karate systems seem to have remained with the generally accepted belt system based on those passed to us from the Japanese Judo system by Kano Sensei.
Okinawan Dan System
1st - 3rd: black belt with silver strip in middle lengthwise
3rd - 6th: black belt with gold strip in middle lengthwise
7th - 9th: red belt with gold strip in middle lengthwise
10th: solid gold obi