Burtles & Tate Opalescent or Vaseline Trough-Mystery Variation

This is a flower trough made by Burtles & Tate in opalescent glass or Vaseline glass,( depending on where you come from.) It is 14 1/2 cm point to point, so not big. It has the registered no. 29106. B&T submitted the design for registration in 1885. It has a pattern of acorns and oak leaves around it.
The National Archives in Kew have it as a flower boat. It is mostly seen as the boat pattern, but seemingly B&T, having registered the design must have decided that the pattern in the boat could be used on other items. I have seen a photo of a curved flower trough, in much the shape of a "C", the flower boat, although hard to find is the one that turns up most frequently. (Shown in the 4th photo )
The triangle that I purchased very cheaply at an Antique Fair in 2011 is the only one I have been able to find. I have been searching the net since then hoping to find another triangle or the curved one or at least the boat (which seems to go for a high price when it does come up)
I cannot believe that since B&T are so well known that there has not been more of the 29106 designs show up. I had a few well known glass experts give me some advice, but even they had never seen or heard of one like it.
Will still keep looking and hoping.