I don't have a clue, all the rest are easily identifiable, clear up to the one to the right of it, a Tortuga, will clear beveling. I just pictured it as a Marshall.
Yeah, now that I look again, yours is not that radical off of a good Marshall..
Here's mine that I thought was a bit off of the standard designs...There IS a Marcos in the Ovrsts with swept wings but look at that base configuration...