There are two versions of this piece, one has a bucket the other a sink. I suspect that the sink caused problems in casting and so a second version was produced. The sink version is the one shown in the White Dwarf 89 ad.
There is also the earlier (and much smaller) WF3 - Complete Adventurer version of the same idea.
Sculptor:
Michael Perry
Painter:
Faron Betchley
Released:
May 1987 - WD89