wine said bottles being provided with a head section or piece the mold entity 10 comprises a top mold 10 a represented in fig3 as well as a bottom mold 10 b represented in fig4 and fig5 the top mold 10 a comprises an upper top mold piece 15 shown in fig6 and mounted in a floating manner and an annular monolithic one part lower top mold piece 13 for molding a part of the stopper length of the stopper s u2032 as well as a part of the head section of the stopper s u2032 the top mold 10 a moreover comprises a medial top mold piece arranged between the lower mold piece 13 and the upper mold piece 15 for molding a part of the length of the stopper having a fixation formation for a seal herein the medial top mold piece includes a horizontally movable first mold piece or mold part 14 a and a horizontally movable second mold piece or mold part 14 b the first mold piece 14 a includes a thread like indentation 140 a and the second mold piece 14 b includes a thread like indentation 140 b the indentations 140 a and 140 b form a negative mold for a thread like fixation formation for a seal of the stopper s u2032 said fixation formation being.