Huge Art Nouveau Teplitz Amphora Royal Dux Shell Center Piece

Any help identifying the origins of this piece would be greatly appreciated. The person I bought this from said that her parents had been told it was an exhibition piece, unfortunately, the information they had was lost over the years. I thought judging by the beautifully depicted maidens that it could possibly be a Bernard Bloch piece?. 27 inches high by 17 inches wide, impressed numbers; 10902  42 with hand-painted 37.

Stylistically, not exactly Nouveau, more classic roccoco, but probably from the same era.
Almost certainly Bohemian/Czech/Austrian.

As for an exhibition piece, well they did make some pretty big pieces, and this could
just be one of a pair, or even from a garniture (3).