I'm sure I've come across it at some point, over the years there have been so many different types of bracing that have been done. Not sure if there's one with precisely the same pattern or arrangement, that's somewhat more doubtful.
Picture of the simple rosette type that I'm fond of. Simple can sometimes be difficult to get right, unless you are copying a well proven design. They don't always work out as first envisioned, I have to scrap some. This one has a very pale green and a rather bronze coloured cedrela, which is why you get the black flecks merging with the black lines. They are just the pores of the cedrela. It is possible to fill these pores with a coloured wax but I didn't bother with this one. My adviser told me to leave it be.