Knowledge / Safety Measures / Watermarks / Changes

Watermark Change: the same postage stamps issued chronologic with different watermarks
Watermark Change: different postage stamps issued chronologic with the same watermark

Watermark Introduction: the same postage stamps issued chronologic on paper without and than with watermark

Watermark Omission: the same postage stamps issued chronologic on paper with and than without watermark

Watermark Design Change: the same postage stamps issued chronologic with different watermark designs

Edition 1890: without watermark
Edition 1906: watermark crosses and circles

Edition 1914: with watermark USPS
Edition 1916: without watermark

Edition 10.1921: lozenges
Edition 01.1922: network

Watermark Design Change: different postage stamps issued chronologic with the same watermark design

Watermark Kind Change: the same postage stamps issued chronologic with the same watermark in different kinds

Watermark Alignment Chage: the same postage stamps issued chronologic with the same watermark in different alignments

postage stamps from 1922, 1923 and 1933 with the same watermark

Edition 1901: single watermark
Edition 1904: multiple watermark

Edition 1881: vertical wavy lines
Edition 1888: horizontal wavy lines

Wasserzeichenzwischenraumänderung: the same postage stamps issued chrono-
logic with the same watermark with different space between two parts

Editions 1874 - 1897: 6 mm space
Editions 1902 - 1936: 2 mm space