Here's an interesting Wikipedia article about this color pattern, splashed white. It doesn't mention it occurring in TBs, but that sure is what it looks like. https://en.wikipedia.org/wiki/Splashed_white
Now I remember where else I saw the Gulastra Plume. It is Cherry Wine. I spotted it during the Belmont post parade.
Thanks, Paniolo_Gal. It would have driven me nuts, but I really didn't have good place to start looking. Glad it just fell back into my lap.