This is a Frank Potts design.
It is two puzzles in one, since the three plate burrs can be assembled on their own (Level : 27 (24.3) ) and a solution where all the pieces are used (Level : 50 (188.8.131.52.15.3)) as shown in the photo.
Three plate burrs intersecting perpendicular and 4 corner pieces. 85 x 85 x 85 mm
It is made from Mansonia and Yellow Wood. The latter is indigenous to South Africa.