Just guesswork, but the colours on the Austrian stamp: are they marital status? Green = single, pink = married, blue = widowed? Particularly, the pattern of the blue segment for women seems to be what you'd expect from (a) life expectancy, (b) war.
In retrospect, this is in the years 1914 – 1919, the deaths are then the result of the First World War. If I look at the stamp, I see the same notch again. It is now among the 60-year-olds. Under the letter "c" on the stamp I would put the consequences of the First World War. The population pyramid on the stamp seems to me to be from (approximately) 1979. And under the letter "d" I would put the population decline due to World War II. Under the letter "e" I place the hesitant "baby boom" after WW II. Between the letters "b" and "d" the "boom" of the Ansluss with Germany in 1938 (11 and 12 March 1938). I can't place the colors (yet).
Just guesswork, but the colours on the Austrian stamp: are they marital status? Green = single, pink = married, blue = widowed? Particularly, the pattern of the blue segment for women seems to be what you'd expect from (a) life expectancy, (b) war.
In retrospect, this is in the years 1914 – 1919, the deaths are then the result of the First World War. If I look at the stamp, I see the same notch again. It is now among the 60-year-olds. Under the letter "c" on the stamp I would put the consequences of the First World War. The population pyramid on the stamp seems to me to be from (approximately) 1979. And under the letter "d" I would put the population decline due to World War II. Under the letter "e" I place the hesitant "baby boom" after WW II. Between the letters "b" and "d" the "boom" of the Ansluss with Germany in 1938 (11 and 12 March 1938). I can't place the colors (yet).