I have also seen this piece before, and believe it came out of a large quality collection in Florida. I have had the opportunity to handle it in person and can add a little to the history.
From what I know this piece has been in the above mentioned collection since 1981 and as such not a copy of the one shown in Frey's book. His book was first published in 1986 with the simular type carving not included in the book until a much later edition.
As for the wrangka being 180 degrees apart, I offer no sensable explanation, perhaps someone else can enlighten us as to the significance of the wrangka being either up or down.
Looking at the photo from the book and the one Rick posted, it looks as it could have been carved by the same carver. It would be interesting if someone could shed a little more light on this "Oddity" as it is rather uncommon and could have been carved in Cirebon on the N. Coast of Jawa or perhaps even in Madura.
