Yep, that headstock "faux omega" (fauxmega?) is interesting. When I first saw it, I remember wondering if it once held an inlay or logo or some sort, especially given those white-ish dots inside the omega. Those might be a red herring, but my first thought was that they may be the remnants of glue that once held something in that circle, but it fell out, or maybe was even intentionally removed.
For example, if you compare it to a Hyak headstock, it starts looking quite similar:


But of course, it may just be exactly what it is now - a decorative omega made by routing out only the top layers. I like it as-is, but with the "JOKER" letters encircling it, it just seems to suggest that something decorative "should" go there.