The watermarks of this issue are interesting even if not very fashionable. The question that has so far not been quite unequivocally answered is whether the watermark that was introduced in 1883 occurs on the 10 and 15 kreuzer values of the 1867 issue. The following article by Dipl. -lng. Wilhelm Klagian, Dombim, on the basis of material illustrated here.
Ferchenbauer 2000 confirms the occurrence of the new watermark on the 2, 3 and 5 kreuzer values of the 1867 issue; as to the 10 and 15 kreuzer stamps Ferchenbauer merely considers this a possibility (that is probably the meaning of the - in lieu of a catalog value on page 436).
Initially Edwin Mueller was also skeptical when he wrote in his book (1927) on page 180: It cannot be determined whether all values were printed on paper with the new watermark; we only know with certainty that the 2, 3 and 5 kreuzer were; at least the 25 and 50 kreuzer were probably not printed on the new type of paper.
By 1932, however, Mueller noted in Die Briefmarke, page 258, that the new watermark with the wider letters had been found on 10 and 15 kreuzer stamps from the second half of 1883, but no supporting material was shown at the time.
About 25 years ago the question arose again and it was pointed out that the new watermark had been found on 10 kreuzer stamps of the 1867 issue from the second half of 1883. But an illustration of the watermark published at that time (Die Briefmarke, No.207, 1976, p. 14), on closer inspection turned out to be the old watermark.
Nevertheless, the belief continued that the new broader watermark also occurred on the 10 and l5 kreuzer stamps. The belief was certainly plausible because the number of 10 kreuzer stamps printed is in the same range as the number of 3 kreuzer values: 150 million as against 196 million (see commemorative volume 75 Years Austrian Postage Stamps, p. XXIV). A respectable 35 million 15 kreuzer stamps were printed, according to the same source. Why should not these two denominations also have been printed on the new paper?
Today we have proof in the form of exemplars from July and August 1883. The watermarks were carefully measured on all four of the stamps shown below and can be identified unequivocally not only by the wider letters but also by the altered form of the B, R E, F, M, A and N.