Size? There are "Offshore cat ketches" at ~30 ft, looks similar to Hereshoff / Freedom line, Tanton Cat Ketches, - larger boats ~ 40 ft, smaller boats from Laser designer
There is new Presto 30
Able yachts made custom cat ketches.
And i probably miss a few.
If you tell me a size and describe how it looked i may identify it.
s/v NEMO - Freedom 28 Cat Ketch, centerboard